CN103174095B - Box girder concrete pouring structure with rear-expanding flanges and construction method thereof - Google Patents
Box girder concrete pouring structure with rear-expanding flanges and construction method thereof Download PDFInfo
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- CN103174095B CN103174095B CN201310086017.9A CN201310086017A CN103174095B CN 103174095 B CN103174095 B CN 103174095B CN 201310086017 A CN201310086017 A CN 201310086017A CN 103174095 B CN103174095 B CN 103174095B
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Abstract
The invention discloses a box girder concrete pouring structure with rear-expanding flanges and a construction method thereof. The construction method comprises the following steps: a main body part of the box girder except for flange plates at the two sides are manufactured through concrete pouring; the main body part is transported to pass through a tunnel; a flange plate template of the box girder is set on two sides of the main body part after the main body part passes through the tunnel; flange plate concrete is poured in the flange plate mold; the flange plate mold is detached after the flange plate concrete is solidified, and construction is completed. The box girder is constructed by pouring the flange plates at the two sides of the box girder after the main body part of the box girder passes through the tunnel, and thus the box girder can pass through the tunnel smoothly, construction is convenient, and benefits are high.
Description
Technical field
The present invention relates to a kind of box girder construction, behind especially a kind of edge of a wing, open up formula box beam concrete pouring structure and construction method thereof.
Background technology
Consult shown in Fig. 1, the upper end of loop tunnel 21 is narrower compared with middle part, when Beam transportation vehicle 22 transport case beam 23 crosses tunnel 21, if case beam 23 size is larger, when exceeding the width of place Plane tunnel 21, case beam 23 cannot adopt full-scale transport by tunnel 21, and now the part frange plate 24 at case beam 23 two ends cannot enter tunnel 21.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can smoothly by opening up formula box beam concrete pouring structure and construction method thereof behind the edge of a wing in tunnel.
For realizing above-mentioned technique effect, open up formula box beam concrete pouring construction method after the invention discloses a kind of edge of a wing, described construction method comprises the following steps:
First build the main part of case beam except the frange plate of both sides;
Transport described main part and pass through tunnel;
After described main part is by tunnel, set up the frange plate template of described case beam in the both sides of described main part;
Described frange plate concrete is poured into a mould in described frange plate template;
After described frange plate concrete setting, remove described frange plate template, complete construction.
Described construction method is further improved and is, when constructing described frange plate template, first the pouring position of corresponding described frange plate sets up supporting frame on the body portion, then establishes described frange plate template in support frame as described above body upper holder.
Described construction method is further improved and is, sets up support frame as described above body and comprises the following steps:
Utilize the spilled water hole of described main part that the first end of the crossbeam at support frame as described above body top is fixedly connected on the top of described main part;
The first end of the support underframe bottom support frame as described above body is fixedly connected in the gravity vent of described main part;
Second end of described crossbeam and the second end of described support underframe are locked.
Described construction method is further improved and is, before the described frange plate concrete of cast, in advance at the external coating interleaving agent of described frange plate template.
Described construction method is further improved and is, carries out transverse stretching and the construction of grouting sealing off and covering anchorage after removing described frange plate template to the frange plate of described moulding by casting.
Formula box beam concrete pouring structure is opened up after the invention also discloses a kind of edge of a wing, comprise the main part of case beam except the frange plate of both sides and the frange plate template of described frange plate, described frange plate template is located at the both sides of described main part by the position rack of the corresponding described frange plate of supporting frame, support frame as described above body comprises the crossbeam at top and the support underframe of bottom further, the first end of described crossbeam is fixedly connected on the top of described main part by the spilled water hole of described main part, the first end of described support underframe is fixedly connected in the gravity vent of described main part, and the second end of the second end of described crossbeam and described support underframe is locked.
Described structure is further improved and is, is provided with plural cushion block between the top of described main part and described crossbeam.
Described structure is further improved and is, is locked between the second end of described crossbeam and the second end of described support underframe by split bolt.
Described structure is further improved and is, the material of described frange plate template is bamboo plywood, and external coating has interleaving agent, and the bottom of described frange plate template is provided with the plural horizontal lumps of wood and the longitudinal lumps of wood of plural number.
Described structure is further improved and is, described support underframe is provided with safety net.
The present invention is owing to have employed above technical scheme, and making it have following beneficial effect is: by the main part at case beam by behind tunnel, the method for pouring box beam both sides frange plate, can make case beam smoothly by tunnel, easy construction, high efficiency.
Accompanying drawing explanation
Fig. 1 is traditional case beam schematic diagram.
Fig. 2 is the structural representation opening up formula box beam concrete pouring structure behind the edge of a wing of the present invention.
Fig. 3 be open up behind the edge of a wing of the present invention formula case beam frange plate be shaped after structural representation.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Consult shown in Fig. 2 and Fig. 3, open up formula box beam concrete pouring structure 1 behind the edge of a wing of the present invention to form primarily of the main part 10 outside the frange plate of case beam both sides and frange plate template 11, when box beam casting, the main part 10 of first pouring box beam, reserved spilled water hole 101 and gravity vent 102, and the frange plate 14 of case beam both sides of constructing after main part 10 is by tunnel, utilize the position of the spilled water hole 101 of main part 10 and the corresponding frange plate 14 of gravity vent 102 in main part 10, set up the supporting frame of frange plate template 11, again frange plate template 11 fixed mount is located on supporting frame.Wherein, supporting frame comprises the crossbeam 12 at top and the support underframe 13 of bottom, crossbeam 12 adopts the channel-section steel of 2 14 to make, its first end 121 is fixedly connected on the top of main part 10 by spilled water hole 101, plural cushion block 15 is provided with between the top of main part 10 and crossbeam 12, the first end 121 of crossbeam 12 is fixed on spilled water hole 101 further by prestress anchorage cable 16, prestress anchorage cable 16 adopts Q235 circle Φ 20 reinforcing bar to make, wear and be fixed in spilled water hole 101, two ends anchor is tight, by first end 121 anchor of crossbeam 12 tightly between the anchor head and main part 10 of prestress anchorage cable 16, utilize the first end 121 of spilled water hole 101 reinforcing crossmember 12.Support underframe 13 adopts scaffolding steel pipe, its first end 131 is fixedly connected in the gravity vent 102 of main part 10, be locked by split bolt 17 between second end 132 of support underframe 13 and the second end 122 of crossbeam 12, support underframe 13 arranges safety net.Frange plate template 11 adopts Φ 14HR335 indented bars 18 to be fixedly connected on crossbeam 12, frange plate template 11 adopts the bamboo plywood of 122cm × 244cm × 1.5cm specification, bottom is provided with the horizontal lumps of wood 19 of 5cm × 5cm, spacing is 40cm, reinforce with the longitudinal lumps of wood 191, spacing 50cm of 10cm × 10cm.
Formula box beam concrete pouring construction method is opened up specific as follows behind the edge of a wing of the present invention:
1, the main part 10 of case beam except both sides frange plate 14 has first been built.
2, Beam transportation vehicle transport main part 10 passes through tunnel.
3, after main part 10 is by tunnel, the pouring position of corresponding frange plate 14 sets up the supporting frame of frange plate template 11 in main part 10.
Set up crossbeam 12 and the support underframe 13 of supporting frame, by the spilled water hole of main part 10, the first end 121 of crossbeam 12 is fixedly connected on the top of main part 10, and is fastened by prestress anchorage cable 16 anchor;
The first end 131 of support underframe 13 is fixedly connected in the gravity vent 102 of main part 10, by the second end 132 of split bolt 17 positioning and locking support underframe 13 and the second end 122 of crossbeam 12.
4, joint treatment
Crossbeam 12 and support underframe 13 set up in place after, first cut-off process is carried out to frange plate 14 place bending reinforcing steel bar, to ensure in reinforcing bar cut-off process that main part 10 edge is concrete complete, carry out rinsing with clear water after dabbing process to new-old concrete junction, and before frange plate 14 concreting brushing interfacial agents.
5, frange plate template 11 is installed
(1) stencil design
For the outward appearance of guard box beam, all frange plate templates 11 all adopt the bamboo plywood of 1.22 × 2.44 × 0.012m specification, and secondary joist adopts the horizontal lumps of wood 19 of 5cm × 5cm, and main joist adopts longitudinal lumps of wood 191 of 10cm × 10cm to reinforce.Frange plate template 11 often saves long 2.44m, and is equipped with suitable pipe nipple to adjust, and the radian of frange plate template 11 processes on the horizontal lumps of wood 19 of secondary joist, and bamboo plywood bends by force and forms;
(2) model sheetinstallat
Frange plate template 11 will have enough intensity, rigidity and stability, want the accurate location of guard box beam each portion shape, size and built-in fitting, the surface that frange plate template 11 contacts with concrete should brushing interleaving agent, gap in frange plate template 11 installation process between strict Control architecture, gap requires to be not more than 2mm, and with sealant sealing, frange plate template 11 faulting of slab ends control at below 1mm;
Template is tackled template and is carried out careful comprehensive inspection after marching into the arena, and it is assembled to carry out examination.
6, reinforcing bar binding and prestress anchorage cable are installed
(1) reinforcing bar binding
All reinforcing bars are completion of processing in beam making field all, and be transported to scene after the assay was approved through supervising engineer and carry out colligation, first carry out reinforcing bar binding, in reinforcement construction, should keep clean in template, and template surface is protected, to ensure the concrete outward appearance of frange plate 14.The minimum clean topping of reinforcing bar is except top board layer is 30mm; all the other are 35mm; and the tail end of tie wire should not stretch in topping; when adopting cushion block 15 to control clean protective layer thickness; cushion block 15 will adopt and the material of case beam with equivalent life, and the durability of guard box beam, cushion block 15 should stagger mutually; dispersed placement also must not traverse the gross section of topping, by the requirement cushion block 4/m of " prestressed concrete technology condition "
2;
(2) prestress anchorage cable is installed
Prestress wire adopts 1 × 7-15.2-1860-GB/T5224-2003 prestress wire, pipeline is formed by metal bellows pore-forming, when spreading bellows, joint will note good seal, blocking pipe when preventing pouring concrete, and corrugated pipe connector place will strictly seal, the spreading of bellows adopts bigger homotype bellows as junction block, joint length is 300mm, and pipe two ends sealant tape or plastic hot draw envelope are wrapped up in, in case seam crossing spillage;
Bending and un should be avoided in bellows installation in position process as far as possible, in case tube wall cracking, also should prevent electric welding spark burn tube wall simultaneously;
After bellows is installed, check the position of bellows, whether curve shape meets designing requirement, and whether fixing of bellows be firm, and whether joint is intact, and whether tube wall is damaged, if any breakage, repairs in time;
After bellows is fixing, steel strand are put on.
7, frange plate 14 concreting and maintenance
After frange plate template 11 installs colligation location; frange plate 14 concrete is poured into a mould in frange plate template 11; concrete is supplied by beam making field mixing station; carefully prestress anchorage cable 16, frange plate template 11, split bolt 17, the tightness of indented bars 18 and the position, quantity etc. of topping cushion block 15 is checked before concreting; and specify special messenger to do the inspection of repeatability, to improve the quality guarantee rate of concrete cover to reinforcement thickness.
(1) concreting
When concreting is passed continuously, off time must not more than 60min, must not random indwelling constuction joint;
(2) concrete vibrating
Vibrator is main as a plug, tackle personnel of vibrating before concreting to divide the work, everyone is made to be responsible for one section, personnel of respectively vibrating answer lower excellent place within the scope of self-responsibility to observe in detail, carefully study, and find out lower excellent position in advance and test, should note vibrating head insertion position at reinforcing bar comparatively dense place, in case vibrating spear is difficult to extract, pay special attention to when vibrating that prestress anchorage cable anchor head place is concrete vibrates, and do not collide bellows, entering slurry with breakage-proof can not stretch-draw;
Operation immersion vibrator, fast inserting is pulled out slowly, and vibrating head displacement should be no more than 1.5 times of its sphere of action, often some time of vibration is about 20s-30s, and when vibrating, vibrating head is twitched up and down slightly, is vibrated to concrete surface bleeding, without sinking, overflowing without a large amount of bubble and being advisable;
(3) receive slurry to wipe one's face
After proposing the leveling of slurry evener, adopt and manually carry out first time and receive slurry, after about 2 hours, then carry out second time receipts slurry and wipe one's face;
(4) concrete curing
Adopt straw bag or gunnysack to cover, sprinkle water after concreting, watering number of times is can keep concrete surface fully moist for degree, and when envionmental humidity is less than 60%, maintenance is no less than 28d; When relative humidity is more than 60%, maintenance is no less than 14d.When environment temperature is lower than 5 DEG C, precast beam surface should spray curing agent, and takes Insulation, must not sprinkle water to concrete.
8, form removable
When concrete strength reaches 60% of design strength, frange plate template 11 limit mould can be removed, and should ensure that frange plate 14 corner angle are complete, when concrete strength, modulus of elasticity reach 100% of design strength, can stretch-draw be carried out, frange plate template 11 bed die can be removed after stretch-draw, unsuitable form removal when temperature sharply changes, after loosening strenthening member, form removal pulls out by manually utilizing guide chain or little jack.
9, transverse prestress construction
After water frange plate 14 transverse prestress rope adopt single hole list anchor underrelaxation steel strand (fpk=1860Mpa), often under bundle anchor, stretching control force is 1346.2Mpa, concrete strength and modulus of elasticity reach after 85% of design strength could stretch-draw, and stretch-draw adopts one-sided staggered stretch-draw.
Get out required ground tackle before stretch-draw, check tensioning equipment, and post tensioning.
Tension sequence is as follows:
0 → initial stress (o ' 0.1con) (making elongation mark) → 0.2o ' con (the quiet 5min of stopping surveys elongation) → 100%o ' con (the quiet 5min that stops surveys elongation) → anchoring
Note: o ' con---refer to design stretch-draw prestressing force.
Strictly operate by specification procedure in stretching process and perform record, guaranteeing that actual stretching force and stretch value reach designing requirement.
1. the cut-out of prestress anchorage cable 16 muscle: stretch-draw terminates, receive after the notice of prestress anchorage cable 16 muscle is cut off in the permission sent out in peace matter portion and can cut off presstressed reinforcing steel, cut off and use angle grinding abrasive disk, require that the distance of presstressed reinforcing steel termination to frange plate 14 termination concrete plane is 3cm, must not 2cm be less than;
2. sealing off and covering anchorage: with epoxy resin rubber cement, painting envelope is carried out to anchor ring bearing plate work anchor intermediate plate girth seam place before sealing off and covering anchorage;
3. mud jacking: peace and quiet hidden part foreign material and pipeline internal water accumulation before mud jacking, match ratio is provided by test room, pressure is preferably 0.6 ~ 0.7MPa, the cement paste of press-in pipeline should be full closely knit, cement paste more than 40min, must not must can be pressed into pipeline after cement paste mixes uniform from mixing to the time in press-in pipeline after the strainer filtering of hole lattice 2.5 × 2.5mm, treats that slurry outlet goes out underflow rear enclosed slurry outlet, dwell time 3-5min, then closes slurry-feeding hole;
4. end-blocking: after mud jacking, peace and quiet cave mouth foreign material (before end-blocking dabbing) can carry out end-blocking after checking and noting pipeline without leakage, before end-blocking, reply ground tackle carries out waterproofing work, and end-blocking steel mesh reinforcement is set, utilize installation screw on anchor plate, be screwed into band hook (hooked) bolt, end-blocking reinforcing bar colligation should form cage of reinforcement with it, and the concrete proportioning of end-blocking is by the given non-shrinkage concrete end-blocking meeting drawing requirement of test room, adopt artificial process vibration template, to concrete tamping;
During slip casting, slurries are by rare to dense, and cement paste water/binder ratio controls between 1:1 ~ 0.6:1, and slurries add early strength admixture and water reducing agent;
When grouting pressure is to rated pressure, stops pressurization, when pressure drops to below 0.6MPa, then continue grouting under pressure.So repeatedly several times, until pressure no longer declines or flow out slurries in adjacent holes;
The conduit having noted slurry blocks aperture immediately, prevents slurries from outflowing, and adopts cement mortar by closely knit for aperture packing, press floating whole after cement slurry sets.
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (8)
1. open up a formula box beam concrete pouring construction method behind the edge of a wing, it is characterized in that described construction method comprises the following steps:
First build the main part of case beam except the frange plate of both sides;
Transport described main part and pass through tunnel;
After described main part is by tunnel, set up the frange plate template of described case beam in the both sides of described main part;
Described frange plate concrete is poured into a mould in described frange plate template;
After described frange plate concrete setting, remove described frange plate template, complete construction;
When constructing described frange plate template, first the pouring position of corresponding described frange plate sets up supporting frame on the body portion, then establishes described frange plate template in support frame as described above body upper holder;
Set up support frame as described above body to comprise the following steps:
Utilize the spilled water hole of described main part that the first end of the crossbeam at support frame as described above body top is fixedly connected on the top of described main part;
The first end of the support underframe bottom support frame as described above body is fixedly connected in the gravity vent of described main part;
Second end of described crossbeam and the second end of described support underframe are locked.
2. construction method as claimed in claim 1, is characterized in that: before the described frange plate concrete of cast, in advance at the external coating interleaving agent of described frange plate template.
3. construction method as claimed in claim 2, is characterized in that: carry out transverse stretching and the construction of grouting sealing off and covering anchorage to the frange plate of described moulding by casting after removing described frange plate template.
4. open up formula box beam concrete pouring structure behind an edge of a wing, it is characterized in that: described structure comprises the main part of case beam except the frange plate of both sides and the frange plate template of described frange plate, described frange plate template is located at the both sides of described main part by the position rack of the corresponding described frange plate of supporting frame, support frame as described above body comprises the crossbeam at top and the support underframe of bottom further, the first end of described crossbeam is fixedly connected on the top of described main part by the spilled water hole of described main part, the first end of described support underframe is fixedly connected in the gravity vent of described main part, and the second end of the second end of described crossbeam and described support underframe is locked.
5. structure as claimed in claim 4, is characterized in that: be provided with plural cushion block between the top of described main part and described crossbeam.
6. structure as claimed in claim 4, be is characterized in that: be locked by split bolt between the second end of described crossbeam and the second end of described support underframe.
7. structure as claimed in claim 4, is characterized in that: the material of described frange plate template is bamboo plywood, and external coating has interleaving agent, and the bottom of described frange plate template is provided with the plural horizontal lumps of wood and the longitudinal lumps of wood of plural number.
8. structure as claimed in claim 4, is characterized in that: described support underframe is provided with safety net.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310086017.9A CN103174095B (en) | 2013-03-18 | 2013-03-18 | Box girder concrete pouring structure with rear-expanding flanges and construction method thereof |
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| CN201310086017.9A CN103174095B (en) | 2013-03-18 | 2013-03-18 | Box girder concrete pouring structure with rear-expanding flanges and construction method thereof |
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| CN103174095B true CN103174095B (en) | 2015-04-15 |
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Families Citing this family (7)
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| CN103362069B (en) * | 2013-07-31 | 2015-07-08 | 中铁六局集团有限公司 | Steel and concrete combined box girder concrete wing plate formwork and construction method |
| CN104480858A (en) * | 2014-10-20 | 2015-04-01 | 中建三局第二建设工程有限责任公司 | Construction method for sealing anchorage of pre-stress concrete box girder and cross girder anchored troughs |
| CN105256769B (en) * | 2015-09-08 | 2017-03-22 | 中国水利水电第五工程局有限公司 | Gate bottom board construction method |
| CN105862599A (en) * | 2016-04-20 | 2016-08-17 | 中铁二十四局集团有限公司 | Construction method of bracket system for suspended casting of T-beam flange plate |
| CN106808564B (en) * | 2017-04-07 | 2023-05-26 | 中铁十七局集团第三工程有限公司 | Three-word buckle type box girder end sealing template and box girder end sealing method |
| CN107806015B (en) * | 2017-10-09 | 2019-03-22 | 中国十七冶集团有限公司 | A kind of unit construction bridge beam flange plate formwork for placing concrete system and construction method |
| CN113106837B (en) * | 2021-04-02 | 2022-08-19 | 长安大学 | Combined box girder wing plate hanging and pouring device capable of adjusting inhaul cable system and construction method |
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