CN110512523B - Construction method of large-span door type upper cross beam split support - Google Patents
Construction method of large-span door type upper cross beam split support Download PDFInfo
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- CN110512523B CN110512523B CN201910715199.9A CN201910715199A CN110512523B CN 110512523 B CN110512523 B CN 110512523B CN 201910715199 A CN201910715199 A CN 201910715199A CN 110512523 B CN110512523 B CN 110512523B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to a construction method of a large-span door type upper crossbeam split support, which is characterized in that a tower column is constructed, and a plurality of embedded parts are respectively arranged at intervals on the middle upper part of the tower column; assembling tower columns from the tower crane hoisting chord members, the upper connecting frame and the lower connecting frame to the upper part of the steel box girder to form a Pi-shaped truss, and fixing the Pi-shaped truss and the tower columns through embedded parts; assembling the top surface of the steel box girder to form a box type truss, hoisting the box type truss to be fixedly connected with the embedded part, and pouring the top of the Pi type truss to form a horizontal beam; and sequentially removing the chord members, the upper connecting frame and the lower connecting frame, combining the upper connecting frame and the lower connecting frame at the upper connecting frame, pouring to form an upper step-shaped decorative block, and combining the box-type truss at the position corresponding to the lower connecting frame and on the inner side of the tower column, pouring to form a lower step-shaped decorative block. The invention adopts factory processing and field assembly connection, has good processing quality, high field construction efficiency, light and handy bracket structure and reduced investment, and the door type upper cross beam and the lower steel box girder can be constructed simultaneously.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method of a large-span portal upper beam split support.
Background
The self-anchored suspension bridge or cable-stayed bridge is increasingly applied to the field of municipal engineering due to the advantages of attractive bridge shape, strong crossing capability and the like, particularly has obvious advantages in river-crossing, railway-crossing or existing highway viaduct areas, often becomes a landmark landscape building, an upper cross beam structure which is an important component of a cable tower needs to meet the requirements of stress and appearance, and particularly, when the lower part of the double-limb cable tower is a transverse connecting structure of a steel box girder constructed by a jacking method and only a portal upper cross beam in the full-height range of the cable tower, the common floor type steel pipe pile support method and the floor type integral steel structure bracket method have many defects.
The disadvantages and shortcomings of the floor type steel pipe pile support method are as follows: the method comprises the following steps that firstly, a door type upper crossbeam and a lower steel box girder are constructed synchronously, the projection range of the door type upper crossbeam is the lower steel box girder, and the door type upper crossbeam conflicts with the position of a floor type steel pipe pile support and cannot avoid the situation due to the pushing requirement of the steel box girder; and secondly, the door type upper cross beam and the lower steel box girder are constructed asynchronously, the door type upper cross beam is constructed after the lower steel box girder is pushed in place in the conventional construction sequence, the total construction period is prolonged inevitably, and the problems of long steel pipe pile support mounting period, high material quantity investment and large welding workload exist because the upper cross beam is high.
The disadvantages and shortcomings of the floor-type integral steel structure bracket method are as follows: the horizontal cross beam, the upper step-shaped decorative block and the lower decorative block which are divided by the first door-type upper cross beam are constructed by adopting an integral steel bracket, the integral steel bracket is required to be laid down from top to bottom, and the problems of multiple positioning, cutting and welding exist, so that the difficulty is high and the construction period is long; and secondly, the horizontal cross beam is constructed by adopting an integral steel bracket, an upper step-shaped decorative block and a lower decorative block by adopting small brackets, and the problems of long construction period and high investment are also solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a construction method of a large-span portal upper beam split support aiming at the defects in the prior art.
According to one aspect of the invention, a construction method of a split bracket of a large-span door type upper beam is provided, which comprises the following steps,
step S1, constructing tower columns, installing steel box girders at the bottoms between the tower columns, and installing a plurality of embedded parts at intervals on the middle upper parts of the tower columns respectively;
step S2, respectively erecting tower cranes on two sides of the tower column, hoisting chord members, upper connecting frames and lower connecting frames of the tower cranes among the tower columns on the upper part of the steel box girder, assembling the chord members, the upper connecting frames and the lower connecting frames to form the Pi-shaped truss, moving the Pi-shaped truss to the embedded part, and fixing the Pi-shaped truss and the tower column through the embedded part;
step S3, assembling a box type truss on the top surface of the steel box girder, hoisting the box type truss to be fixedly connected with the embedded part, and pouring the top of the Pi-shaped truss to form a horizontal beam;
step S4, arranging a hanging lowering system on the horizontal beam, sequentially removing the chord member, the upper connecting frame and the lower connecting frame, pouring the upper connecting frame and the lower connecting frame on the inner side of the tower column corresponding to the position where the upper connecting frame is arranged to form an upper step-shaped decorative block, and pouring the box-type truss on the inner side of the tower column corresponding to the position where the lower connecting frame is arranged to form a lower step-shaped decorative block;
and step S5, hoisting the box-type truss to the steel box girder through a hanging and lowering system, and dismantling the steel box girder.
On the basis of the above scheme, preferably, in the step S1, at least three embedded parts are installed at intervals on the middle upper part of the tower column; and reinforcing rods are arranged in the cavities of the tower columns at the embedded parts.
Preferably, in step S2, the lower connecting frame is triangular, the upper connecting frame is parallelogram-shaped, the upper connecting frame is spliced with the lower connecting frame, and the tops of the two upper connecting frames are connected with the chord member to form the pi-shaped truss.
Preferably, based on the above scheme, step S4 includes removing the upper connecting frame, installing a cross beam, a small longitudinal beam, a coil-fastened scaffold and a formwork system on the inner side of the tower column supported by the lower connecting frame for installing the lower connecting frame, and pouring the upper stepped decorative block three times.
Preferably, based on the above scheme, step S4 includes removing the lower connecting frame, installing a beam, a disc-buckle scaffold and a formwork system on the inner side of the tower column corresponding to the lower connecting frame by using the box-type truss as a support, and pouring the lower step-shaped decorative block three times.
Preferably, on the basis of the scheme, the lower connecting frame comprises four first inclined legs, supporting rods and pull rods, the four first inclined legs are arranged at intervals, one ends of the inclined legs are inclined and connected with embedded parts on the tower column, one ends of the pull rods are connected with the other ends of the inclined legs, the other ends of the pull rods are connected with the embedded parts on the tower column, one ends of the supporting rods are connected with the pull rods, the other ends of the supporting rods are connected to the middle parts of the first inclined legs, and the adjacent first inclined legs are connected through suspension pull rods.
On the basis of the scheme, preferably, the upper connecting frame and the lower connecting frame are in bolted connection.
On the basis of the scheme, the box-type trusses are preferably arranged at the positions lower than the pi-type trusses.
Compared with the prior art, the invention has the following advantages:
1. the industrial processing, the on-site assembly and connection, the processing quality is good, and the on-site construction efficiency is high.
2. The support structure is light and handy, reduces and drops into.
3. The door type upper cross beam and the lower steel box girder can be constructed simultaneously.
4. The split support does not need to be disassembled and then recycled and reused, construction of different block sections of the door type upper cross beam is achieved through disassembling from top to bottom section by section, the construction period is shortened, and the frequency of high-altitude operation is reduced.
5. The pi-shaped truss and the box-shaped truss have an integral function. When the two are combined together for common use, the construction of the horizontal beam can be realized, the pi-shaped truss plays a role of a bearing structure, and the box-shaped truss plays a role of a horizontal pull rod.
6. The pi-shaped truss has an independent function. After the pi-shaped truss chord member and the upper connecting frame are removed, the remaining lower connecting frame can realize the construction of the concrete of the upper step-shaped decorative block.
7. The box-type truss has an independent function. When the chord member and the lower connecting frame are dismantled from the pi-shaped truss, the function of a dismantling platform and a high-altitude protection platform is achieved; the lower decoration block is used as a bracket during construction.
Drawings
FIG. 1 is a schematic elevation view of the construction of step one of the present invention;
FIG. 2 is a schematic elevation view of the construction in step two of the present invention;
FIG. 3 is a schematic elevation of the construction of step three of the present invention;
FIG. 4 is a schematic elevation view of the construction of step four of the present invention;
FIG. 5 is a cross-sectional view of FIG. 4;
FIG. 6 is a schematic elevation view of the construction of step five of the present invention;
FIG. 7 is a schematic elevation of the construction of step six of the present invention;
FIG. 8 is a cross-sectional view of FIG. 7;
FIG. 9 is a schematic elevation view of the process of step seven of the present invention;
FIG. 10 is a schematic elevation view of the construction of step eight of the present invention;
FIG. 11 is a cross-sectional view of FIG. 10;
FIG. 12 is a schematic elevation view of the process of step nine of the present invention.
Detailed Description
As shown in fig. 1 to 12, the construction method of the split bracket of the long-span portal upper beam of the present invention includes the following steps:
firstly, constructing two parallel tower columns 1, installing a steel box girder 11 at the bottom between the tower columns 1, and embedding and fixing the steel box girder to a designed embedded part 2/4 by using a creeping formwork; after the tower column 1 is constructed to the top of the tower, a reinforcing rod 4 is installed in a cavity inside the tower column 1 to ensure the connection strength of the embedded part 3, please refer to fig. 1;
secondly, a tower crane 5 is used for hoisting the chord member 6.3, the upper connecting frame 7 and the lower connecting frame 8 to the tower column on the upper part of the steel box girder, the chord member 6.3, the upper connecting frame 7 and the lower connecting frame 8 are assembled to form a pi-shaped truss 6, the pi-shaped truss 6 is transferred to the embedded part 3, and the pi-shaped truss 6 and the tower column 1 are fixed through the embedded part 3, please refer to fig. 2;
thirdly, installing a lifting device 10 at the top of the tower column 1, lifting the pi-shaped truss 6 to the position of the embedded part and welding and fixing the pi-shaped truss, then assembling and welding the box-shaped truss 12 on the top surface of the steel box girder 11, lifting the box-shaped truss 12 to the position of the embedded part 2 by using the lifting device 10 and welding and fixing the box-shaped truss, and referring to fig. 3;
fourthly, mounting a small crossbeam, a disc buckle type scaffold and a template system on the top surface of the pi-shaped truss 6, and pouring for three times to complete the horizontal crossbeam 13.1, please refer to fig. 4 and 5;
fifthly, arranging a hanging lowering system 14 on the top surface of the horizontal beam 13.1, connecting the hanging lowering system 14 with the chord 6.3 after removing the small beam, the disc buckle type scaffold and the template system on the top surface of the pi-shaped truss 6, and removing the upper connecting frame 7, please refer to fig. 6;
sixthly, using the lower connecting frame 8 as a support, installing a cross beam, a small longitudinal beam, a disc buckle type scaffold and a template system on the top surface of the lower connecting frame 8 on the inner side of the tower column 1, and pouring an upper step-shaped decorative block 13.2 for three times on the inner side of the tower column 1 and at the position corresponding to the position where the upper connecting frame 7 is installed, please refer to fig. 7 and 8;
seventhly, the lower connecting frame 8 is removed by using the hanging and lowering system 14, please refer to fig. 9;
eighthly, using the box-type truss 12 as a support, installing a small crossbeam, a coil buckle type scaffold and a template system on the top surface of the box-type truss 12, and pouring a lower decorative block 13.3 for three times at a position on the inner side of the tower column 1 and corresponding to the lower connecting frame 8, please refer to fig. 10 and 11;
and ninthly, hoisting and dropping the box-type truss 12 to the top surface of the steel box girder 11 by using the hanging and dropping system 14, and dismantling, so as to complete the whole construction of the door-type upper beam 13 and the dismantling work of the split support, please refer to fig. 12.
It should be noted that the lower connecting frame 8 of the present invention includes four first inclined legs 81, support rods 82 and pull rods 83, the four first inclined legs 81 are disposed at intervals, and one end of each first inclined leg 81 is connected to an embedded part on the tower column 1 in an inclined manner, one end of each pull rod 83 is connected to the other end of each first inclined leg 81, and the other end of each pull rod 83 is connected to an embedded part on the tower column 1, one end of each support rod 82 is connected to each pull rod 83, the other end of each support rod 82 is connected to the middle of each first inclined leg 81, and adjacent first inclined legs 81 are connected by a suspension pull rod 84, and the specific structure is shown in fig. 3 and 4.
The upper connecting frame 7 of the present invention includes four frame bodies 71 and suspension rods 72, the four frame bodies 71 are in an isosceles trapezoid shape, the waist of the frame body 71 is connected to the bottom end surfaces of the pull rod 83 and the chord rod 6.3 of the lower connecting frame 8, the adjacent frame bodies 71 are connected through the suspension rods 72, the frame body 71 of the present invention is composed of a first rod body 711, a second rod body 712 and a support rod 713, the first rod body 711 and the second rod body 712 are arranged in parallel, the length of the first rod body 711 is greater than that of the second rod body 712, and the first rod body 711 and the second rod body 712 are connected through the support rod 713.
The second step includes the steps of lifting the lower connecting frame 8 of the pi-shaped truss 6 by using the tower crane 5, temporarily fixing the two outer first oblique legs 81 by using a climbing cone reserved on the inner side wall of the tower column 1, arranging a suspension rod 84 between the two first oblique legs 81, lifting and installing the two inner first oblique legs 81, positioning and fixing the two first oblique legs through a supporting rod 82 and a pull rod 83, lifting the upper connecting frame 7 (comprising four frame bodies 71 and suspension rods 72) after the lower connecting frames 8 on the left side and the right side are all installed in place, connecting the upper connecting frame 7 and the lower connecting frame 8 through bolts 80, and finally lifting the chord 6.3 (comprising two outer chord rods 6.3.1 and two inner chord rods 6.3.2) and firmly connecting the upper connecting frame 7 to complete the whole assembling of the pi-shaped truss 6.
After the chord members 6.3, the upper connecting frame 7 and the lower connecting frame 8 are assembled to form the pi-shaped truss 6, the pi-shaped truss 6 is moved to the embedded part, and the pi-shaped truss 6 and the tower column 1 are fixed through the embedded part.
In the fifth step, firstly, the small cross beam, the plate buckle type scaffold and the template system on the top surface of the pi-shaped truss 6 are dismantled, secondly, the suspension rods 72 between the upper connecting frames 7 and the suspension rods 84 between the lower connecting frames 8 are dismantled, then, the hanging and lowering system 14 is arranged on the top surface of the horizontal cross beam 13.1, the hanging and lowering system 14 is connected with the chord members 6.3, then, the bolts 80 between the upper connecting frames 7 and the lower connecting frames 8 are sequentially removed for 4 times, finally, when the horizontal cross beam is deviated along the longitudinal direction until the horizontal cross beam is not interfered with the lower connecting frames 8, the horizontal cross beam is lifted, lowered to the top surface of the box-shaped truss 12 and is divided into loose pieces, and then the loose pieces fall to the top surface of the steel box girder 11, and the loose pieces divided by the chord members 6.3 are partially poured to the cross beam for constructing the upper stepped decorative block 13.2.
In summary, the main advantages of the present invention are as follows:
1. compared with a floor type steel pipe pile support, the construction period can be shortened, and investment can be saved;
2. compare and do not have the whole steel structure bracket of console mode, reduce the installation number of times to once by the cubic, can effectively practice thrift the time limit for a project.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A construction method of a large-span door type upper beam split bracket is characterized by comprising the following steps,
step S1, constructing tower columns, installing steel box girders at the bottoms between the tower columns, installing a plurality of embedded parts at intervals on the middle upper parts of the tower columns respectively, and installing at least three embedded parts at intervals on the middle upper parts of the tower columns; reinforcing rods are arranged in the cavities of the tower columns at the positions of the embedded parts;
step S2, respectively erecting tower cranes on two sides of the tower column, hoisting chords, upper connecting frames and lower connecting frames of the tower cranes among the tower columns on the upper portion of the steel box girder to form pi-shaped trusses, assembling the chords, the upper connecting frames and the lower connecting frames to form pi-shaped trusses, moving the pi-shaped trusses to the positions of the embedded parts, fixing the pi-shaped trusses and the tower column through the embedded parts, enabling the lower connecting frames to be triangular, enabling the upper connecting frames to be parallelogram-shaped, enabling the upper connecting frames to be assembled with the lower connecting frames, and connecting the tops of the two upper connecting frames with the chords to form the pi-shaped trusses;
step S3, assembling a box type truss on the top surface of the steel box girder, hoisting the box type truss to be fixedly connected with the embedded part, and pouring the top of the Pi-shaped truss to form a horizontal beam;
step S4, arranging a hanging lowering system on the horizontal beam, sequentially removing the chord member, the upper connecting frame and the lower connecting frame, pouring the upper connecting frame and the lower connecting frame on the inner side of the tower column corresponding to the position where the upper connecting frame is arranged to form an upper step-shaped decorative block, and pouring the box-type truss on the inner side of the tower column corresponding to the position where the lower connecting frame is arranged to form a lower step-shaped decorative block;
removing the upper connecting frame, using the lower connecting frame as a support to mount a cross beam, a small longitudinal beam, a disc buckle type scaffold and a template system on the inner side of the tower column corresponding to the upper connecting frame, and pouring for three times to finish the upper step-shaped decorative block;
removing the lower connecting frame, mounting a cross beam, a disc buckle type scaffold and a template system on the inner side of the tower column corresponding to the lower connecting frame by taking the box type truss as a support, and pouring for three times to finish a lower step-shaped decorative block;
and step S5, hoisting the box-type truss to the steel box girder through a hanging and lowering system, and dismantling the steel box girder.
2. The construction method of the split bracket of the long-span portal upper beam as claimed in claim 1, wherein the lower connection bracket includes four first slant legs, a support rod and a pull rod, the four first slant legs are spaced apart from each other such that one end of each slant leg is connected to an embedded part on the tower column in an inclined manner, one end of the pull rod is connected to the other end of each slant leg and the other end of the pull rod is connected to the embedded part on the tower column, one end of the support rod is connected to the pull rod, the other end of the support rod is connected to the middle part of the first slant leg, and adjacent first slant legs are connected to each other by a suspension pull rod.
3. The construction method of the split bracket of the long-span portal upper beam as claimed in claim 1, wherein the upper connecting frame and the lower connecting frame are bolted.
4. The construction method of the split bracket of the long-span portal upper beam as claimed in claim 1, wherein the box type truss is arranged at a position lower than the pi type truss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910715199.9A CN110512523B (en) | 2019-08-05 | 2019-08-05 | Construction method of large-span door type upper cross beam split support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910715199.9A CN110512523B (en) | 2019-08-05 | 2019-08-05 | Construction method of large-span door type upper cross beam split support |
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| CN110512523A CN110512523A (en) | 2019-11-29 |
| CN110512523B true CN110512523B (en) | 2022-04-15 |
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| CN111455847A (en) * | 2020-03-12 | 2020-07-28 | 中铁大桥局集团有限公司 | Layered construction method suitable for bridge tower high haunch upper beam |
| CN112727093B (en) * | 2020-12-28 | 2022-09-09 | 中材建设有限公司 | Climbing construction method for constructing large-span high-rise building |
| CN112900268B (en) * | 2021-01-12 | 2023-02-17 | 中铁七局集团武汉工程有限公司 | Mounting process of full-hall support and template system |
| CN112900269A (en) * | 2021-01-12 | 2021-06-04 | 中铁七局集团武汉工程有限公司 | Construction process of cable tower cross beam |
| CN112942107B (en) * | 2021-01-13 | 2023-02-17 | 中铁七局集团武汉工程有限公司 | Hydraulic creeping formwork construction process in cable tower construction process |
| CN112942106A (en) * | 2021-01-13 | 2021-06-11 | 中铁七局集团武汉工程有限公司 | Construction method of portal cable tower |
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| KR100667921B1 (en) * | 2005-12-13 | 2007-01-11 | 재현토건(주) | Construction method of pylon using precast concrete beam |
| CN104109999B (en) * | 2014-06-26 | 2016-08-24 | 中铁大桥局集团有限公司 | The construction method of bridge tower thwart beam |
| CN106436573B (en) * | 2015-10-28 | 2018-08-21 | 中铁四局集团有限公司 | Superelevation Sarasota large span upper beam bracket steel truss stand construction method |
| CN106677070B (en) * | 2016-12-31 | 2019-01-04 | 中铁一局集团有限公司 | A kind of high-altitude long-span heavy duty construction of beam bracket and construction method |
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