CN104074141A - Construction method for small-radius curve fish belly type continuous box girder - Google Patents
Construction method for small-radius curve fish belly type continuous box girder Download PDFInfo
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- CN104074141A CN104074141A CN201410327127.4A CN201410327127A CN104074141A CN 104074141 A CN104074141 A CN 104074141A CN 201410327127 A CN201410327127 A CN 201410327127A CN 104074141 A CN104074141 A CN 104074141A
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Abstract
The invention discloses a construction method for a small-radius curve fish belly type continuous box girder. A bowl buckle type support combined with an arc-shaped channel steel support is used as a supporting system, and a bamboo plywood of a straight bending technology is laid on the supporting system to be used as a bottom die of the box girder. According to the construction method, the supporting system of the bowel buckle type support combined with fixed-shaped channel steel is used, the construction is made to achieve sequencing and standardization, construction and operation are easy and convenient, the construction speed is improved, the construction period is shortened, customization of a large quantity of fixed-shaped steel dies is avoided, investment is reduced, resources can be repeatedly used in construction revolving, and good economic benefits are achieved.
Description
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Technical field
The construction method that the present invention relates to a kind of sharp radius curve fish-belly continuous box beam, belongs to technical field of buildings.
Background technology
At present, along with expanding economy, the scale of China's urban infrastructure is increasing, and overhead road of city, overpass bridge are not only promoting the traffic ability in city, also becomes the view of beauty together in city.Superstructure is heavy in section fish-belly continuous box beam, with the cross section line style of its grace, novel outward appearance, by more overhead road of city, adopted gradually, but its profile and stressed comparatively complicated, variable curvature arc section is wayward, in addition, linear control, the reinforcing bar processing of curved surface complicated structure and the space orientation of the design of box girder formwork and support system, sharp radius curved box girder, the control of complicated plane of bending structural concrete pouring quality all become difficult point and the emphasis of construction.
Summary of the invention
The invention provides a kind of construction method of sharp radius curve fish-belly continuous box beam.
Technical scheme of the present invention is: a kind of construction method of sharp radius curve fish-belly continuous box beam, comprises the following steps:
(1) set up bowl fastening type support: unwrapping wire lay plank on former surface of base, adjustable collet is installed on plank, on adjustable collet, link bowl fastening type support, adjustable collet is corresponding with the vertical rod of bowl fastening type support, and the upper end of vertical rod all arranges adjustable jacking;
(2) making of bed die support: according to fish-bellied type box section design line style, with channel-section steel, strike out and meet linear cambered surface, and be welded into sizing steelframe with square steel pipe ribbing, the straightway three slice of steelframe at the bottom of by two segmental arcs and case forms, with flange, be connected with bolt respectively, along distribute spacing is identical with the vertical rod longitudinal pitch in step (1) along the bridge, cambered surface is fixed on steelframe;
(3) the bed die support in step (2) is fixedly mounted on the bowl fastening type support in step (1), and on bed die support the longitudinal place mat lumps of wood, on the lumps of wood fixedly bamboo offset plate as bottom die of box-beam, after bottom die of box-beam has spliced, for preventing bed die edge joint position spillage, adopt building putties to criticize embedding, joint filling, guarantee the smooth imporosity of adjacent seam, case beam side adopts bamboo offset plate and lumps of wood rib to process, by multistage broken line, be connected, at every section of broken line rise place, add and play timber wedge, then be adjusted to the curve that meets case beam side line style.
Preferably, before pier foundation ditch and original surface are cleared up carrying out step (1), then adopted gravel soil back-filling in layers compacting to form bed course, on bed course, concreting forms concrete bottom, and top of concrete is made 1% ~ 2% horizontal wall inscription.
Preferably, also comprise bearing installation, on pier bed course pre-embedded steel slab, accurately emit bearing center line, settle pot bearing, in bearing top board relevant position, pre-embedded steel slab is set, behind location, adopts symmetrical interrupted mode to weld, after welding, will put in welding position rust and process.
Preferably, also comprise that case beam steel is installed, core is installed, case beam underplate concrete is built and the step such as concrete curing.
Preferably, when case beam base plate is carried out to concreting, vibrator size matching is used, small vibration rod for the intensive place of reinforcing bar, the large vibrating head in the sparse place of reinforcing bar, determine that rational base plate longitudinally builds length, accurately hold the concrete initial setting time, sufficient secondary vibration is carried out in butt joint place and new-old concrete junction, guarantee that junction is closely knit, must not stay constuction joint.
Beneficial effect of the present invention: the present invention adopts bowl fastening type support in conjunction with fixed slot steel bracket system, make construction sequence, standardization, and constructing operation is easy, improve speed of application, shortened the duration, the large quantities of sizing punching blocks of customization have been avoided, reduce input, can make again resource in construction turnover recycling, obtained better economic benefit.
Accompanying drawing explanation
Fig. 1 is the construction flow chart of the construction method of sharp radius curve fish-belly continuous box beam of the present invention;
Fig. 2 is the structural representation of Small Radius curve fish-belly continuous box beam of the present invention;
In figure: 1 bottom die of box-beam, 2 bed die supports, 3 bowl fastening type supports, 4 concrete bottoms, 5 planks, 6 adjustable jackings, 7 adjustable collets.
The specific embodiment
By reference to the accompanying drawings embodiment provided by the invention is described in further detail:
As shown in Figure 1, 2, a kind of construction method of sharp radius curve fish-belly continuous box beam, comprises the following steps:
(1) ground is processed
After pier foundation ditch and original surface are cleared up, the back-filling in layers of general employing gravel soil, indivedual soft foundations are changed back-up sand gravel pad or adopt cement Stability Gravel to process, ground degree of compaction is not little by 95%, the C20 concrete of building thick 10 ~ 15cm on the bed course after compacting, top of concrete is made 1% ~ 2% horizontal wall inscription, and higher than original ground place, be beneficial to draining, foundation treatment principle is that base bearing capacity meets construction requirement.
(2) support is set up
Set up bowl fastening type support 3: unwrapping wire lay plank 5 on concrete bottom 4, adjustable collet 7 is installed on plank 5, on adjustable collet 7, is linked bowl fastening type support 3, adjustable collet 7 is corresponding with the vertical rod of bowl fastening type support 3, vertical rod adopts the spacing of 0.9*0.9m, step pitch 1.2m; Crossbeam, web place vertical rod horizontal spacing are encrypted, the upper end of vertical rod all arranges adjustable jacking 6, vertical rod base top, and the liftoff 20cm of being not more than place adds the horizontal and vertical bar of sweeping the floor, 4m spacing arranges vertical and horizontal direction shearing support, to guarantee the resistance to overturning of support;
The making of bed die support 2: according to fish-bellied type box section design line style, with 80 type channel-section steels, strike out and meet linear cambered surface, and be welded into sizing steelframe with the ribbing of 50*50*2.5 mm square steel pipe, the straightway three slice of steelframe at the bottom of by two segmental arcs and case forms, with flange, be connected with bolt respectively, along distribute spacing is identical with vertical rod longitudinal pitch along the bridge, cambered surface is fixed on steelframe;
Bed die support 2 is fixedly mounted on bowl fastening type support 3, and on bed die support 2 the longitudinal place mat cross section 10*10*400cm lumps of wood, according to the arranged with interval of 30cm, under web, crossbeam according to the arranged with interval of 15cm, on the lumps of wood fixedly 2440*1220*15mm bamboo offset plate as bottom die of box-beam 1.
(3) bed die and side form splicing
1. the center line that make case soffit, bracket, by this center line, is installed medial arc steelframe after bilateral symmetry is arranged, and by design pitch, indulges bridge to laying the 10*10cm lumps of wood.Bottom die of box-beam 1 adopts and is of a size of 2440*1220*15mm bamboo offset plate, straight curved nail on arc square yoke.The transverse and longitudinal alignment as far as possible of scab seam, arrangement regulation.To the splicing gap that in case beam, outside inequality in circumference length causes, cutting bamboo offset plate is filled up.For preventing bed die edge joint position spillage, behind bed die splicing location, adopt building putties to criticize embedding, joint filling, guarantee the smooth imporosity of adjacent seam.
2. the broken line of case beam side becomes the adjustment of camber line, the high 40cm of top board side form, adopt bamboo offset plate and lumps of wood rib to process, broken line is connected, at the every section of rise place of taking out stitches, add and play timber wedge, timber wedge thick wide be that 1cm to 2.5cm is thick, make the straight line side plate of certain toughness become the curve conforming to design line style, guarantee that the whole line style of curved box girder is smoother attractive in appearance.
(4) bearing is installed
On pier bed course pre-embedded steel slab, accurately emit bearing center line, settle pot bearing, in bearing top board relevant position, pre-embedded steel slab is set, behind location, by the symmetrical interrupted mode of employing, weld, impact on rubber tile, polyfluortetraethylene plate while noting preventing excess Temperature during welding, will put in welding position rust and process after welding.
(5) precompressed and bed die absolute altitude are adjusted
According to JGJ/T194-2009 < < steel pipe full framing precompressed tecnical regulations > > method and step, box beam bracket is carried out to precompressed and settlement monitoring, will be according to precompressed achievement by the absolute altitude of adjustable jack adjusting pole after precompressed completes, eliminate nonelastic deformation, reserved elastic deformation camber.
(6) reinforced bar engineering
Sharp radius curve fish-bellied type case beam steel is comparatively dense, and the processing of the processing of its base plate arch steel, web arch steel skeleton reinforcing steel bar and space orientation, the joint reasonable layout of longitudinal reinforcement are, the colligation of labyrinth reinforcing bar order etc. all become construction Difficulties.When reinforcement detailing, utilize computer CAD draughtsmanship to curved surface reinforced three-dimensional modelling, the longitudinal reinforcement joint location distribution simulation of carrying out, optimized processing method and erection sequence, specific practice:
1. computer graphics is carried out reinforcement detailing
1) principle that Curved steel bar is less than to 5mm by arc string vector distance is simulated, and guarantees the linear and protective layer thickness of reinforcing bar curve, for bar bending provides curved length and crooked offset distance, realizes batch machining.
2) every longitudinally long bar splice is simulated by saving material and stressed less distribution, base plate longitudinal reinforcement joint should not be located at base plate span centre 1/4L scope for span length, top end bar splice should not be located within the scope of top board bearing both sides 1/4L, and reinforcing bar is numbered to processing, during installation with straight thread successively spreading.
3) longitudinal web reinforcement skeleton reinforcing steel bar is arranged on by joint to internal force is less carries out computer simulation, carries out segmental machining, during installation, carry out skeleton splicing by number by welding method, it is whole that welding becomes.
4) crossbeam cage of reinforcement is processed into integral body in advance, during installation, carries out integral hoisting.
2. case beam steel is installed
1) with adopting total station instrument coordinate method to emit crossbeam, web axis on case beam base plate, the web axis point of curved box girder is encrypted every 2 meters one, for reinforcement installation provides line position accurately.
2) erection sequence: first lifting cross beam cage of reinforcement → base plate lower floor's transverse and longitudinal reinforcing bar → web reinforcement skeleton and distributing bar → base plate top reinforcement → top board reinforcing bar.
3) all reinforcing bar bindings and installation, all will strictly press designing requirement, and carry out with reference to construction and standards of acceptance.
(7) core is installed
Core adopts 15mm bamboo offset plate and 4*7 cm ribbing flitch to process in advance, to arc section, directly curves the cambered surface that meets design with bamboo offset plate, accomplishes smoother without knuckle.The core of making in advance there is is the transporting and hoisting of being convenient to and is connected, accelerate speed of application.Internal mold adopts steel pipe inner support and screw rod to drawing mode while installing, and guarantees that support is firm, piece is tightly smooth.And between core and reinforcing bar the cushion block of cushioning respective numbers, guarantee thickness of protection tier.
(8) case beam underplate concrete is built
Case beam base plate is fish-bellied type curved surface, be highly 2m, and reinforcing bar is intensive, vibrating of underplate concrete becomes key and the difficult point that box beam concrete is built, for assurance underplate concrete any surface finish, without voids and pits and dew muscle, vibration compacting, in traditional continuous box girder concreting method, progress is improved, and forms following technology and field control measure:
1. according to vibrating spear operating radius, calculate the pore size distribution of vibrating, at fish-bellied type curved surface internal mold, determine that the hole of reasonably vibrating is arranged and the installation site of attached vibrator.
2. definite rational base plate is longitudinally built length, generally suitable with 5m, accurately holds the concrete initial setting time, and sufficient secondary vibration is carried out in butt joint place and new-old concrete junction, guarantees that junction is closely knit, must not stay constuction joint.
3. vibrate and use with immersion vibrator size matching, small vibration rod for the intensive place of reinforcing bar, the large vibrating head in the sparse place of reinforcing bar.Vibrating head displacement is no more than 1.5 times of vibrating head operating radius.
4. reduce the drop that concrete enters mould and prevent segregation, base plate plays segmental arc and builds thickness and be difficult for surpassing 30cm, and while being beneficial to vibrate, bubble is discharged.
5. for reducing blibbing, adopt secondary vibration technique, the process of vibrating is even, forbids leakage to be shaken and shakes, and guarantees in the outer light of concrete real.
6. adopt the people concreter that is skilled in technique, and the personnel of vibrating are divided to the region of vibrating, clearly defining responsibilities.
By to the improvement of concreting technology and meticulous organization and administration, make building of box beam concrete coherent in order, get a desired effect.
(9) concrete curing
After concrete placing, at case beam bottom plate top surface and top board end face, closely cover geotextiles in time, reduce open-assembly time as far as possible, prevent surface moisture evaporation.With trowel rubbing and pressure surface at least twice, after concrete initial set, want non-textile mulch watering maintenance in time, carry out special messenger's maintenance personal management.
In this manual, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, manual and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. a construction method for sharp radius curve fish-belly continuous box beam, is characterized in that, comprises the following steps:
(1) set up bowl fastening type support: unwrapping wire lay plank on former surface of base, adjustable collet is installed on plank, on adjustable collet, link bowl fastening type support, adjustable collet is corresponding with the vertical rod of bowl fastening type support, and the upper end of vertical rod all arranges adjustable jacking;
(2) making of bed die support: according to fish-bellied type box section design line style, with channel-section steel, strike out and meet linear cambered surface, and be welded into sizing steelframe with square steel pipe ribbing, the straightway three slice of steelframe at the bottom of by two segmental arcs and case forms, with flange, be connected with bolt respectively, along distribute spacing is identical with the vertical rod longitudinal pitch in step (1) along the bridge, cambered surface is fixed on steelframe;
(3) the bed die support in step (2) is fixedly mounted on the bowl fastening type support in step (1), and on bed die support the longitudinal place mat lumps of wood, on the lumps of wood fixedly bamboo offset plate as bottom die of box-beam, after bottom die of box-beam has spliced, for preventing bed die edge joint position spillage, adopt building putties to criticize embedding, joint filling, guarantee the smooth imporosity of adjacent seam, case beam side adopts bamboo offset plate and lumps of wood rib to process, by multistage broken line, be connected, at every section of broken line rise place, add and play timber wedge, then be adjusted to the curve that meets case beam side line style.
2. the construction method of sharp radius curve fish-belly continuous box beam according to claim 1, it is characterized in that, before pier foundation ditch and original surface are cleared up carrying out step (1), then adopt gravel soil back-filling in layers compacting to form bed course, on bed course, concreting forms concrete bottom, and top of concrete is made 1% ~ 2% horizontal wall inscription.
3. the construction method of sharp radius curve fish-belly continuous box beam according to claim 2, it is characterized in that, also comprise bearing installation, on pier bed course pre-embedded steel slab, accurately emit bearing center line, settle pot bearing, in bearing top board relevant position, pre-embedded steel slab is set, behind location, adopts symmetrical interrupted mode to weld, after welding, will put in welding position rust and process.
4. the construction method of sharp radius curve fish-belly continuous box beam according to claim 1 and 2, is characterized in that, also comprises that case beam steel is installed, core is installed, case beam underplate concrete is built and the step such as concrete curing.
5. the construction method of sharp radius curve fish-belly continuous box beam according to claim 4, it is characterized in that, when case beam base plate is carried out to concreting, vibrator size matching is used, small vibration rod for the intensive place of reinforcing bar, the large vibrating head in the sparse place of reinforcing bar, determines that rational base plate longitudinally builds length, accurately hold the concrete initial setting time, sufficient secondary vibration is carried out in butt joint place and new-old concrete junction, guarantees that junction is closely knit, must not stay constuction joint.
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Cited By (6)
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| CN105178164A (en) * | 2015-08-25 | 2015-12-23 | 广西交通科学研究院 | Prefabricated lifting fish-belly corrugated steel web internal-prestress combined box beam and construction method thereof |
| CN105568854A (en) * | 2015-12-17 | 2016-05-11 | 广州市恒盛建设工程有限公司 | Construction method of overwater curved fish-bellied cast-in-place reinforced concrete box girder |
| CN109352285A (en) * | 2018-11-30 | 2019-02-19 | 中国冶集团有限公司 | A kind of production method of hyperboloid fish-belly continuous box beam Variable Section Steel template |
| CN110258341A (en) * | 2019-06-20 | 2019-09-20 | 广州市第二市政工程有限公司 | A kind of raising pedestrian way of bridge curved section longitudinal rib ride comfort construction method |
| CN110700100A (en) * | 2019-10-11 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Bailey beam bundle construction method for cast-in-situ platform of high-pier small-radius curve ramp bridge |
| CN117418477A (en) * | 2023-12-18 | 2024-01-19 | 中交一航局第三工程有限公司 | Fish-bellied box girder anti-floating reinforcement template system and installation and construction method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178164A (en) * | 2015-08-25 | 2015-12-23 | 广西交通科学研究院 | Prefabricated lifting fish-belly corrugated steel web internal-prestress combined box beam and construction method thereof |
| CN105568854A (en) * | 2015-12-17 | 2016-05-11 | 广州市恒盛建设工程有限公司 | Construction method of overwater curved fish-bellied cast-in-place reinforced concrete box girder |
| CN105568854B (en) * | 2015-12-17 | 2017-04-05 | 广州市恒盛建设工程有限公司 | Shaped form fish-bellied type cast-in-situ steel reinforced concrete box girder construction method waterborne |
| CN109352285A (en) * | 2018-11-30 | 2019-02-19 | 中国冶集团有限公司 | A kind of production method of hyperboloid fish-belly continuous box beam Variable Section Steel template |
| CN110258341A (en) * | 2019-06-20 | 2019-09-20 | 广州市第二市政工程有限公司 | A kind of raising pedestrian way of bridge curved section longitudinal rib ride comfort construction method |
| CN110700100A (en) * | 2019-10-11 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Bailey beam bundle construction method for cast-in-situ platform of high-pier small-radius curve ramp bridge |
| CN117418477A (en) * | 2023-12-18 | 2024-01-19 | 中交一航局第三工程有限公司 | Fish-bellied box girder anti-floating reinforcement template system and installation and construction method thereof |
| CN117418477B (en) * | 2023-12-18 | 2024-03-29 | 中交一航局第三工程有限公司 | Fish-bellied box girder anti-floating reinforcement template system and installation and construction method thereof |
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Application publication date: 20141001 |