CN101881003A - Installation method of post tensioned prestressed concrete box girders - Google Patents
Installation method of post tensioned prestressed concrete box girders Download PDFInfo
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- CN101881003A CN101881003A CN 201010232662 CN201010232662A CN101881003A CN 101881003 A CN101881003 A CN 101881003A CN 201010232662 CN201010232662 CN 201010232662 CN 201010232662 A CN201010232662 A CN 201010232662A CN 101881003 A CN101881003 A CN 101881003A
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- slideway
- prestressed concrete
- concrete box
- box girders
- post tensioned
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Abstract
The invention relates to an installation method of post tensioned prestressed concrete box girders, which is characterized by comprising the following steps of: (1) installation of a supporting device: laying a first supporting frame and a second supporting frame within a prestressed reinforcing steel tensile section along the installation direction of the post tensioned prestressed concrete box girders, laying a first slideway on the first supporting frame and a second slideway on the second supporting frame; (2) installation of the post tensioned prestressed concrete box girders: firstly, swinging up 5-12 post tensioned prestressed concrete box girders by adopting a gantry crane with the hoisting weight of 100t, and placing the post tensioned prestressed concrete box girders on the first slideway and the second slideway of the supporting device; and secondly, enabling the post tensioned prestressed concrete box girders to run on the first slideway and the second slideway by a hand-drive block so as to assemble two adjacent post tensioned prestressed concrete box girders. The invention has the advantages of simple and convenient construction and low cost.
Description
Technical field
The invention belongs to precast prestressed concrete case beam installation Technology field, be specifically related to a kind of mounting method of post tensioned prestressed concrete box girders.
Background technology
Each span centre of precast assembly section has 8-12 piece case beam by interim compressive pre-stress extruding the case beam closely to be bolted together with adhering with epoxy resin, stretch-draw steel hinge line then, form continuous span, after tension of prestressed tendon is intact, with its unloading (when bridge is installed be that construction section install with a tension of prestressed tendon section).Carry out next section precast concrete case beam and install, the whole bridge of prefabricated case beam only needs can satisfy the prefabricated case beam installation once striding half bracing frame.Precast concrete case beam adopts hoisting weight to lift for the 100t straddle truck, and the box-shaped sheet beam of lifting is sling with straddle truck, is placed on the support.There is the end face cleaning of shear connector clean the box-shaped plate, then two blocks of adjacent box-shaped plates are tried assembly unit, after corresponding convex-concave two sides matches fully, a box-shaped plate of back lifting is hung about last 1000m, the brushing work of epoxy resin is carried out in preparation, will glue a series of activities such as obedient duct sealing ring because of the duct that will carry out the brushing of epoxy resin, every beam between the every beam, every beam is all wanted just can finish about two hours, and straddle truck can not wait for a long time.
Summary of the invention
The mounting method that the purpose of this invention is to provide a kind of easy construction, post tensioned prestressed concrete box girders that cost is low.
For achieving the above object, the technical solution used in the present invention is: the mounting method of post tensioned prestressed concrete box girders is characterized in that it comprises the steps:
1) installation of bracing or strutting arrangement:
In a tension of prestressed tendon section, lay first bracing frame and second bracing frame along the direction that post tensioned prestressed concrete box girders is installed, first bracing frame is parallel with second bracing frame, on first bracing frame, lay first slideway, on second bracing frame, lay second slideway, first slideway is parallel with second slideway, and the spacing between first slideway and second slideway is less than the width of post tensioned prestressed concrete box girders bottom surface;
2) installation of post tensioned prestressed concrete box girders:
1. adopting hoisting weight is that the 100t straddle truck is placed on the handling of 5-12 piece post tensioned prestressed concrete box girders on first slideway and second slideway of bracing or strutting arrangement, has the end face cleaning of shear connector clean post tensioned prestressed concrete box girders;
2. by bottle gouard moved by hands post tensioned prestressed concrete box girders is walked on first slideway and second slideway, one end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that has fixed, the other end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that promptly will move, two adjacent post tensioned prestressed concrete boxes are carried out assembly unit, before corresponding convex-concave two sides matches fully, carry out the brushing work of epoxy resin; So far, finish the installation of post tensioned prestressed concrete box girders.
Method of the present invention makes full use of exactly to be set up dismounting bowl button frame is as support system (i.e. first bracing frame and second bracing frame) flexibly, easily, on the bracing frame of having set up, slideway is installed, adopt hoisting weight to be placed on first slideway and second slideway, by bottle gouard moved by hands post tensioned prestressed concrete box girders is walked on slideway then for the 100t straddle truck carries out handling precast concrete case beam.
The invention has the beneficial effects as follows:
1, easy construction, workable; (can under the narrow situation in place, carry out) applied widely.
2, use this method that post tensioned prestressed concrete box girders is installed, (this method cost is low) can reduce cost, bracing frame is set up dismounting flexibly, conveniently, and has comprehensive technology economic benefit (economic benefit, social benefit and environmental benefit are obvious) preferably.Solved the technical barrier that post tensioned prestressed concrete box girders also can be walked without straddle truck on slideway.
Description of drawings
Fig. 1 is the installation drawing of post tensioned prestressed concrete box girders;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of first bracing frame;
Fig. 4 is the structural representation of first slideway;
Among the figure: 1-first bracing frame, 2-first slideway, 3-second bracing frame, 4-second slideway, 5-post tensioned prestressed concrete box girders, 6-sleeper, adjusting screw mandrel under the 7-, 8-bridging, 9-vertical rod, 10-adjusted screw mandrel, the horizontal i iron (14 of 11-
#I iron), 12-cross bar, the vertical i iron (20 of 13-
#I iron), 14-corrosion resistant plate, 15-polyfluortetraethylene plate, 16-steel plate.
The specific embodiment
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the mounting method of post tensioned prestressed concrete box girders, it comprises the steps:
1) installation of bracing or strutting arrangement:
Bracing or strutting arrangement comprises first bracing frame 1, first slideway 2, second bracing frame 3, second slideway 4;
In a tension of prestressed tendon section, lay first bracing frame 1 and second bracing frame 3 along the direction that post tensioned prestressed concrete box girders (abbreviation prefabricated case beam) is installed, first bracing frame 1 is parallel with second bracing frame 3, on first bracing frame 1, lay first slideway 2, on second bracing frame 3, lay second slideway 4, first slideway 2 is parallel with second slideway 4, and the spacing between first slideway 2 and second slideway 4 (is that post tensioned prestressed concrete box girders 5 can be shelved on first slideway 2 less than the width of post tensioned prestressed concrete box girders 5 bottom surfaces, on second slideway 4);
Concrete steps are:
1. preparation: suspender (snap ring, wire rope etc.) and tensioner are prepared; The examination of cementitious materials is joined with safety technics and is told somebody what one's real intentions are; Ground is handled: surperficial loose ground is removed in the backfill zone, changes the aggregate grading material compacting of filling out 500～800mm, the plain concrete sealing that 50～100mm is thick, and the thick iron plate of 10mm is spread on the surface; Original state ground will be adjusted to graded sand and stone on the same absolute altitude face to surperficial absolute altitude in length and breadth, and concrete thickness depends on the circumstances; Concrete surface is received light and is formed the gradient, must not ponding;
2. the laying of first bracing frame 1 and second bracing frame 3: in a tension of prestressed tendon section, longitudinally lay left sleeper row, the right sleeper row (basis of left sleeper row formation second bracing frame 3, right sleeper row constitutes the basis of first bracing frame 1), left sleeper row is parallel with right sleeper row; Each sleeper row's sleeper 6 and the spacing between the sleeper 6 are 600mm; The length and width of sleeper 6, the thick 2500mm*250mm*250mm that is of a size of;
Along laterally all establishing 7 following adjusting screw mandrels 7, the spacing of the following adjusting screw mandrel 7 on the same sleeper is 300mm on sleepers 6 all on left sleeper row and the right sleeper row;
In the upper end of all vertical rods 9 adjusted screw mandrel 10 is set;
On the adjusted screw mandrel 10 that is positioned at above the same sleeper, lay horizontal i iron 11 again; Form first bracing frame 1 and second bracing frame 3;
3. on the horizontal i iron 11 of first bracing frame 1, longitudinally lay vertical i iron 13 of first slideway 2, on the horizontal i iron 11 of second bracing frame 3, longitudinally lay vertical i iron 13 of second slideway 4;
At the upper surface spot welding corrosion resistant plate 14 of vertical i iron 13, lay polyfluortetraethylene plate 15 as slide plate at the upper surface of corrosion resistant plate 14, on polyfluortetraethylene plate 15, lay steel plate steel plate 16;
Vertical i iron 13 of first slideway 2 is parallel with vertical i iron 13 of second slideway 4, and the spacing between vertical i iron 13 of the vertical i iron 13 of first slideway 2 and second slideway 4 is less than the width of post tensioned prestressed concrete box girders 5 bottom surfaces; Form bracing or strutting arrangement;
2) installation of post tensioned prestressed concrete box girders:
1. adopting hoisting weight is that the 100t straddle truck is placed on the handling of 5-12 piece post tensioned prestressed concrete box girders on first slideway 2 and second slideway 4 of bracing or strutting arrangement, has the end face cleaning of shear connector clean post tensioned prestressed concrete box girders;
2. by bottle gouard moved by hands post tensioned prestressed concrete box girders 5 is walked on first slideway 2 and second slideway 4, one end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that has fixed, the other end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that promptly will move, and two adjacent post tensioned prestressed concrete boxes are carried out assembly unit;
Before matching fully, corresponding convex-concave two sides carries out the brushing work of epoxy resin; Because of the brushing that will carry out epoxy resin between the every beam, when using epoxy resin, from be brushed to be bonded together till, must in official hour, finish (smaller or equal to 2 hours), and concrete surface to keep dry state; Serviceability temperature is 5 ℃-30 ℃, as surpassing 30 ℃, allows to shorten greatly service time, also is difficult to use, so must use as early as possible behind the mix; During brushwork epoxy resin, generally use rubber brush, manually wear Rubber gloves and smear, the thickness of epoxy resin is advisable about with 1mm, and (the brushing amount of epoxy resin is 1.5Kg/m
2); Therefore a mix amount should suitably be controlled according to the brushing progress at scene; Epoxy resin tries not to adhere on the skin during use; If be stained with on the skin, use cloth and wipe or solvent scouring;
So far, finished the installation of post tensioned prestressed concrete box girders.
Claims (3)
1. the mounting method of post tensioned prestressed concrete box girders is characterized in that it comprises the steps:
1) installation of bracing or strutting arrangement:
In a tension of prestressed tendon section, lay first bracing frame (1) and second bracing frame (3) along the direction that post tensioned prestressed concrete box girders is installed, first bracing frame (1) is parallel with second bracing frame (3), go up laying first slideway (2) at first bracing frame (1), go up laying second slideway (4) at second bracing frame (3), first slideway (2) is parallel with second slideway (4), and the spacing between first slideway (2) and second slideway (4) is less than the width of post tensioned prestressed concrete box girders (5) bottom surface;
2) installation of post tensioned prestressed concrete box girders:
1. adopting hoisting weight is that the 100t straddle truck is placed on the handling of 5-12 piece post tensioned prestressed concrete box girders on first slideway (2) and second slideway (4) of bracing or strutting arrangement, has the end face cleaning of shear connector clean post tensioned prestressed concrete box girders;
2. by bottle gouard moved by hands post tensioned prestressed concrete box girders (5) is gone up walking at first slideway (2) and second slideway (4), one end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that has fixed, the other end of bottle gouard moved by hands ties up on the post tensioned prestressed concrete box girders that promptly will move, two adjacent post tensioned prestressed concrete boxes are carried out assembly unit, before corresponding convex-concave two sides matches fully, carry out the brushing work of epoxy resin; So far, finish the installation of post tensioned prestressed concrete box girders.
2. the mounting method of post tensioned prestressed concrete box girders according to claim 1 is characterized in that: the installation of described bracing or strutting arrangement, and concrete steps are:
1. preparation: surperficial loose ground is removed in the backfill zone, changes the aggregate grading material compacting of filling out 500～800mm, the plain concrete sealing that 50～100mm is thick, and the thick iron plate of 10mm is spread on the surface; Original state ground will be adjusted to graded sand and stone on the same absolute altitude face to surperficial absolute altitude in length and breadth;
2. the laying of first bracing frame (1) and second bracing frame (3): in a tension of prestressed tendon section, longitudinally lay left sleeper row, right sleeper row, left side sleeper row constitutes the basis of second bracing frame (3), right sleeper row constitutes the basis of first bracing frame (1), and left sleeper row is parallel with right sleeper row; Each sleeper row's sleeper (6) and the spacing between the sleeper (6) are 600mm; The length and width of sleeper (6), the thick 2500mm*250mm*250mm that is of a size of;
All sleepers (6) are gone up along laterally all establishing 7 following adjusting screw mandrels (7) on left sleeper row and right sleeper row, and the spacing of the following adjusting screw mandrel (7) on the same sleeper is 300mm;
In all upward installation vertical rods (9) of adjusting screw mandrel (7) down, fixing by cross bar (12) between vertical rod (9) and the vertical rod (9), the vertical rod that is positioned at same sleeper top is fixing by bridging (8);
In the upper end of all vertical rods (9) adjusted screw mandrel (10) is set;
Go up and lay horizontal i iron (11) being positioned at adjusted screw mandrel (10) above the same sleeper again; Form first bracing frame (1) and second bracing frame (3);
3. on the horizontal i iron (11) of first bracing frame (1), longitudinally lay vertical i iron (13) of first slideway (2), on the horizontal i iron (11) of second bracing frame (3), longitudinally lay vertical i iron (13) of second slideway (4);
First slideway (2) comprises vertical i iron (13), corrosion resistant plate (14), polyfluortetraethylene plate (15), steel plate (16); The structure of second slideway (4) is identical with the structure of first slideway (2);
At the upper surface spot welding corrosion resistant plate (14) of vertical i iron (13), lay polyfluortetraethylene plate (15) as slide plate at the upper surface of corrosion resistant plate (14), go up at polyfluortetraethylene plate (15) and lay steel plate steel plate (16);
Vertical i iron (13) of first slideway (2) is parallel with vertical i iron (13) of second slideway (4), and the spacing between vertical i iron (13) of first slideway (2) and the vertical i iron (13) of second slideway (4) is less than the width of post tensioned prestressed concrete box girders (5) bottom surface; Form bracing or strutting arrangement.
3. the mounting method of post tensioned prestressed concrete box girders according to claim 1, it is characterized in that: the brushing amount of epoxy resin is 1.5Kg/m
2
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| CN2010102326623A CN101881003B (en) | 2010-07-21 | 2010-07-21 | Installation method of post tensioned prestressed concrete box girders |
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| CN2010102326623A CN101881003B (en) | 2010-07-21 | 2010-07-21 | Installation method of post tensioned prestressed concrete box girders |
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| CN101881003A true CN101881003A (en) | 2010-11-10 |
| CN101881003B CN101881003B (en) | 2011-11-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614972A (en) * | 2013-11-06 | 2014-03-05 | 中铁二十一局集团第二工程有限公司 | Steel truss vertical and horizontal position adjusting device |
| CN104612063A (en) * | 2014-12-26 | 2015-05-13 | 北京交通大学 | Concrete box beam first-aid repair method with prefabricated part on-site assembling combination beam |
| CN105155422A (en) * | 2015-09-15 | 2015-12-16 | 中国一冶集团有限公司 | Method for controlling pre-camber and pre-offsetting during mounting of post-tensioning precast prestressed concrete box girders |
| CN110777668A (en) * | 2019-11-13 | 2020-02-11 | 中铁二院工程集团有限责任公司 | Incremental launching construction method for precast concrete bridge deck slab of steel-concrete composite beam |
| CN112482740A (en) * | 2020-10-27 | 2021-03-12 | 中国一冶集团有限公司 | Large concave curved working face construction operation device and construction operation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614972A (en) * | 2013-11-06 | 2014-03-05 | 中铁二十一局集团第二工程有限公司 | Steel truss vertical and horizontal position adjusting device |
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| CN104612063A (en) * | 2014-12-26 | 2015-05-13 | 北京交通大学 | Concrete box beam first-aid repair method with prefabricated part on-site assembling combination beam |
| CN105155422A (en) * | 2015-09-15 | 2015-12-16 | 中国一冶集团有限公司 | Method for controlling pre-camber and pre-offsetting during mounting of post-tensioning precast prestressed concrete box girders |
| CN110777668A (en) * | 2019-11-13 | 2020-02-11 | 中铁二院工程集团有限责任公司 | Incremental launching construction method for precast concrete bridge deck slab of steel-concrete composite beam |
| CN112482740A (en) * | 2020-10-27 | 2021-03-12 | 中国一冶集团有限公司 | Large concave curved working face construction operation device and construction operation method thereof |
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| Publication number | Publication date |
|---|---|
| CN101881003B (en) | 2011-11-30 |
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