CN108677732B - Auxiliary movable formwork girder suspension retreating construction method suitable for variable cross-section girder section - Google Patents
Auxiliary movable formwork girder suspension retreating construction method suitable for variable cross-section girder section Download PDFInfo
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- CN108677732B CN108677732B CN201810634347.XA CN201810634347A CN108677732B CN 108677732 B CN108677732 B CN 108677732B CN 201810634347 A CN201810634347 A CN 201810634347A CN 108677732 B CN108677732 B CN 108677732B
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- bailey
- girder
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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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- 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
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention belongs to the technical field of construction of movable formwork of bridge engineering, and provides a suspension retreating construction method of an auxiliary movable formwork girder, which is suitable for a variable-section girder section. The invention can effectively solve the problem that the movable formwork can not be lowered in situ, and safely and efficiently finish the lowering construction of the movable formwork. Through adjustment sliding track and bailey column position, can also continuously retreat in the variable cross-section roof beam scope, and then reduce the mechanical equipment input, save the operating expenses, effectively shorten the moving die carrier retreat time simultaneously, reduce construction safety risk.
Description
Technical Field
The invention belongs to the technical field of movable formwork construction in bridge engineering, and particularly relates to an auxiliary movable formwork girder suspension retreating construction method for realizing safe retreating of a movable formwork girder of a variable-section beam section to a lowering point by assembling a simple crossbeam, an electric winch and a fixed pulley block.
Background
Urban rail transit capital construction engineering develops rapidly, and urban bridge structures, geographic environment are more complicated, have the movable mould frame and end to stride the girder and receive the unable problem of transferring of environmental impact. The traditional method of retreating the self corbels hole by hole is mostly adopted in the conventional retreating process of the self-propelled movable formwork, and the conventional process has the defects that the corbels need to be repeatedly transported and repeatedly solidified at high altitude in the construction process, the working procedures are frequently changed, the construction period is long, and the high altitude operation risk is large; the method of making the movable mould frame continuously retreat by adopting the customized retreat beam also has the defects of high cost and inflexible use, and can not be used for the continuous retreat construction of the variable-section beam section.
The invention relates to a method for processing a semiconductor chip.
Disclosure of Invention
The invention aims to solve the problems that the tail span of a movable formwork of an urban bridge cannot be lowered and a girder at a section with a gradually changed beam width on a beam surface cannot be continuously retreated, and further provides a construction method for suspending and retreating the girder of an auxiliary movable formwork, which is suitable for a section with a variable cross section.
The invention adopts the following technical scheme:
a simple crossbeam is connected with a rear crossbeam of a movable formwork, the simple crossbeam is connected with a main beam of the movable formwork, and then the main beam of the movable formwork is driven to continuously retreat by operating a longitudinal pushing device of the rear crossbeam of the movable formwork.
The simple cross beam stretches across the poured box girder and is parallel to the rear cross beam of the movable formwork, a plurality of sliding tracks are longitudinally arranged on the top surface of the poured box girder, the bottom of the simple cross beam is connected with the sliding tracks in a matched mode and can freely slide and walk along the sliding tracks, two groups of winches are symmetrically arranged at two ends of the simple cross beam, and the two groups of winches are connected with the main beams of the movable formwork on the corresponding sides through fixed pulley blocks and steel wire ropes respectively.
The simple cross beam comprises a Bailey cross beam and Bailey columns, the Bailey cross beam is parallel to the rear cross beam of the movable formwork, two ends of the Bailey cross beam are suspended out of two sides of a poured box girder, two groups of Bailey columns are symmetrically connected below the Bailey cross beam through U-shaped bolts and integrally form a pi-shaped structure, a plurality of walking wheels which slide along sliding tracks are correspondingly arranged at the bottom of the Bailey columns, a winch mounting platform is mounted on the top surfaces of two ends of the Bailey cross beam, and a winch is mounted on the winch mounting platform.
The number of the sliding tracks arranged below each group of Bailey columns is not less than four, the four sliding tracks are parallel to each other and are arranged at equal intervals, and the walking wheels at the bottoms of the Bailey columns are correspondingly matched with each sliding track to walk in the sliding tracks. Because the whole width of the sliding tracks is the supporting width of the Bailey column, the bearing capacity and the running stability of the Bailey column need to be considered comprehensively, and the number of the I-steel sliding tracks is not less than 4 aiming at the width of a common continuous bridge.
The sliding track is formed by longitudinally splicing a plurality of I-shaped steels, and square timbers are laid in the bottom notches of the I-shaped steels.
The winch mounting platform is transversely and adjustably mounted on the Bailey beam through a plurality of connecting H-shaped steel and finish-rolled deformed steel bars, and the continuous retreating of the main beam of the movable formwork can be realized in a self-adaptive manner by comprehensively adjusting the mounting distances of the two side sliding rails, the two side Bailey columns and the two groups of winches in the moving process.
The construction method for assembling the simple cross beam and installing the electric winch and the fixed pulley block can ensure that the movable mould frame can safely move backwards, effectively solves the problem that the movable mould frame can not be placed in the original position, and safely and efficiently completes the placement construction of the movable mould frame; meanwhile, the width distance of the two groups of winches, the sliding tracks and the position of the Bailey column are adjusted, so that the continuous retreating of the variable-section beam section can be self-adapted, the retreating construction period of the movable formwork is further shortened, the investment of mechanical equipment is reduced, the construction cost is saved, and the construction safety risk is reduced.
Drawings
FIG. 1 is a schematic plan view of a simple beam assembly;
FIG. 2 is a cross-sectional view of a simplified cross-beam assembly;
FIG. 3 is a cross-sectional view of a simple beam;
in the figure: the method comprises the following steps of 1-Bailey beam, 2-Bailey column, 3-winch installation platform, 4-connecting I-steel, 5-fixed pulley block, 6-sliding track, 7-poured box girder, 8-movable formwork main girder and 9-winch.
Detailed Description
The embodiments of the invention will be further explained with reference to the accompanying drawings:
the invention realizes safe backward movement and in-situ lowering of the movable mould frame by assembling the simple cross beam and installing the electric winch and the fixed pulley block, namely, the simple cross beam is connected with the rear cross beam, the movable mould frame is driven to integrally retreat by operating the longitudinal pushing device of the rear cross beam, and the movable mould frame can continuously retreat within the range of the variable-section beam by adjusting the positions of the sliding track and the Bailey sheet. The method specifically comprises the following steps;
A) 4 rows of I-shaped steel of I-shaped 25 type are arranged on two sides of the top surface of the poured box girder along the longitudinal direction respectively to be used as sliding rails 6;
B) paving 5 x 10 square timbers at the bottoms of the I-beams, and polishing joints of the I-beams and the I-beams to avoid dislocation;
C) a hard PVC plate (coated with butter) is laid in the 25I-steel groove;
D) two groups of 45-shaped single-layer double-row bailey pieces (both provided with reinforcing Xuan rods) in the longitudinal direction of the bottom layer are erected on the I-shaped steel to serve as bailey columns 2, and the bailey columns 2 on the two sides are symmetrically arranged;
E) 2 groups of 45-type single-layer double-row Bailey sheets are transversely erected on the top layer and connected through U-shaped bolts to serve as the Bailey beams 1, and the Bailey beams 1 and the Bailey columns 2 are also connected through the U-shaped bolts;
F) two ends of the top of a top-layer Bailey sheet (namely a Bailey beam) are respectively provided with 5 groups of I20I-beams, a steel plate with the thickness of 20mm is arranged on the I-beams to serve as a winch mounting platform 3, and the steel plate and the I-beams are connected by adopting finish-rolled deformed steel bars to form a simple beam;
G) the 10t electric winches are respectively arranged on the winch mounting platforms at the two sides, and are wound around 4 movable pulley blocks through steel wire ropes;
H) the end part of the steel wire rope is connected with the main beam of the movable mould frame, and after the simple cross beam is installed, the simple cross beam is connected with the C-shaped beam of the movable mould frame by the steel wire rope to reinforce the whole body;
I) the main beam is lifted by the winch, and after the trial hoisting is finished, the hydraulic system drives the movable mould frame to move forwards integrally;
J) and the movable mould frame continuously retreats and walks until the retreating construction is completed.
The devices or components which are not specifically described in the invention are all the prior art, for example, the C-shaped beam, the rear cross beam, the pushing device and the like of the movable formwork are all conventional technologies in continuous beam construction, and the details are not described in the invention.
Claims (4)
1. A suspension retreating construction method of an auxiliary movable formwork girder suitable for a variable-section girder section is characterized in that a simple crossbeam is connected with a rear crossbeam of a movable formwork and is connected with the girder of the movable formwork, and then the longitudinal pushing device of the rear crossbeam of the movable formwork is operated to drive the movable formwork girder to realize continuous retreating;
the simple cross beam stretches across the poured box girder and is arranged parallel to the rear cross beam of the movable mould frame, a plurality of sliding tracks are longitudinally arranged on the top surface of the poured box girder, the bottom of the simple cross beam is connected with the sliding tracks in a matched manner and can freely slide and walk along the sliding tracks, two groups of winches are symmetrically arranged at two ends of the simple cross beam, and the two groups of winches are respectively connected with the main beams of the movable mould frame at the corresponding sides through fixed pulley blocks and steel wire ropes;
the winch mounting platform is transversely and adjustably mounted on the Bailey beam through a plurality of connecting H-shaped steel and finish-rolled deformed steel bars, and the continuous retreating of the main beam of the movable formwork can be realized in a self-adaptive manner by adjusting the mounting distances of the two side sliding rails, the two side Bailey columns and the two groups of winches in the moving process.
2. The auxiliary moving die carrier girder suspension retreating construction method applicable to the variable cross-section girder section of claim 1, wherein the simple beam comprises a bailey beam and bailey columns, the bailey beam is arranged parallel to a rear beam of the moving die carrier, two ends of the bailey beam are suspended outside two sides of a poured box girder, two groups of bailey columns are symmetrically connected below the bailey beam, the two groups of bailey columns and the bailey beam are integrally in a pi-shaped structure, a plurality of travelling wheels sliding along a sliding track are correspondingly arranged at the bottom of the bailey columns, winch mounting platforms are mounted on top surfaces of two ends of the bailey beam, and a winch is mounted on the winch mounting platforms.
3. The auxiliary movable formwork girder suspension retreating construction method suitable for the variable cross-section beam section as claimed in claim 2, wherein no less than four sliding tracks are arranged below each group of Bailey columns, the four sliding tracks are parallel to each other and are arranged at equal intervals, and the traveling wheels at the bottoms of the Bailey columns are correspondingly matched with each sliding track to travel in.
4. The auxiliary moving die frame girder suspension retreating construction method suitable for the variable cross-section beam section as claimed in claim 3, wherein the sliding track is formed by longitudinally splicing a plurality of I-beams, and square timbers are laid in bottom notches of the I-beams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634347.XA CN108677732B (en) | 2018-06-20 | 2018-06-20 | Auxiliary movable formwork girder suspension retreating construction method suitable for variable cross-section girder section |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810634347.XA CN108677732B (en) | 2018-06-20 | 2018-06-20 | Auxiliary movable formwork girder suspension retreating construction method suitable for variable cross-section girder section |
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| CN108677732A CN108677732A (en) | 2018-10-19 |
| CN108677732B true CN108677732B (en) | 2021-02-05 |
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| CN114319110B (en) * | 2021-12-02 | 2023-10-10 | 中交一航局第一工程有限公司 | Construction method for integrally lowering large-tonnage movable formwork |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101892633B (en) * | 2010-07-22 | 2012-03-14 | 中交第二航务工程局有限公司 | Self-propelled small radius movable mould frame |
| CN102561188A (en) * | 2010-12-23 | 2012-07-11 | 上海市基础工程有限公司 | Suspension balance beam of mobile formwork bridge fabrication machine |
| CN202440764U (en) * | 2012-01-16 | 2012-09-19 | 中铁一局集团有限公司 | Longitudinal movement device for main beams of moveable formwork |
| CN104594205B (en) * | 2015-01-31 | 2016-05-11 | 长安大学 | Self-propelled moveable formwork rear cross beam and main beam connecting structure |
| KR101770230B1 (en) * | 2015-07-17 | 2017-08-22 | 다올이앤씨 주식회사 | Form traveller |
| CN106522113B (en) * | 2016-11-19 | 2018-01-09 | 中交路桥建设有限公司 | The overall continuous rear annealing method in mobile formwork beam face |
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