CN108544655A - The curved beam prefabricated construction method of curved bridge - Google Patents
The curved beam prefabricated construction method of curved bridge Download PDFInfo
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- CN108544655A CN108544655A CN201810314286.9A CN201810314286A CN108544655A CN 108544655 A CN108544655 A CN 108544655A CN 201810314286 A CN201810314286 A CN 201810314286A CN 108544655 A CN108544655 A CN 108544655A
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 15
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims abstract description 6
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000002002 slurry Substances 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 16
- 238000013461 design Methods 0.000 claims description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 10
- 238000009415 formwork Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009417 prefabrication Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 244000007853 Sarothamnus scoparius Species 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 235000003283 Pachira macrocarpa Nutrition 0.000 claims description 2
- 240000001085 Trapa natans Species 0.000 claims description 2
- 235000014364 Trapa natans Nutrition 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 235000009165 saligot Nutrition 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 6
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/046—Post treatment to obtain pre-stressed articles
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of curved beam prefabricated construction methods of curved bridge, including：Step a, mounting rail rib and diaphragm plate reinforcing bar；Step b, bellows is installed；Step c, installation form；Step d, slab reinforcement is installed；Step e, hogging moment bellows is installed；Step f, concreting；Step g, maintenance and form removal；Step h, prestressed stretch-draw and mud jacking；Wherein, internal lining pipe is worn in bellows, and tensioning is influenced for mortar leakage prevention.The construction method has broken the common process limitation of curved bridge cast-in-place construction, takes curve song to do technique, meets bridge Horizontal Curve requirement, fully show curved bridge line style.
Description
Technical Field
The invention relates to the field of buildings, in particular to a curve bridge curved beam prefabricating construction method.
Background
With the development of urban road and highway traffic, curved bridges are increasingly widely applied and become important bridge types in modern traffic engineering. The construction method of the curved bridge is mainly based on cast-in-place, and the curved bridge with a larger radius can be realized by adopting a precast beam piece process and a curve straight making mode.
Therefore, in order to more fully show the curve bridge line type and meet the design requirement of a flat curve of a bridge, a new curve bridge curved beam prefabricating construction method is urgently needed to be provided.
Disclosure of Invention
The invention aims to provide a curve bridge curved beam prefabricating construction method, which breaks through the conventional process limitation of curve bridge cast-in-place construction, adopts a curve making process, meets the design requirement of a bridge flat curve and fully shows the curve type of a curve bridge.
In order to achieve the purpose, the invention provides a curved bridge curved beam prefabricating construction method, which comprises the following steps:
step a, mounting beam ribs and transverse partition plate reinforcing steel bars;
b, mounting a corrugated pipe;
c, installing a template;
d, mounting panel steel bars;
step e, mounting a hogging moment corrugated pipe;
f, pouring concrete;
step g, maintaining and removing the mold;
step h, prestress tension and grouting; wherein,
and a lining pipe is arranged in the corrugated pipe in a penetrating way and is used for preventing slurry leakage from influencing tension.
Preferably, the step a comprises binding steel bars according to a drawing, marking steel bar position lines on the base, placing the steel bars according to the lines, and welding and fixing the longitudinal and transverse intersections; wherein,
the position of the pipeline is ensured to be unchanged at the collision position of the pipeline and the steel bar, and the position of the steel bar is moved.
Preferably, the step b comprises positioning the corrugated pipe according to the coordinates on the drawing and fixing the corrugated pipe by using the positioning steel bars.
Preferably, step c comprises: 1. assembling the template by using a shaped steel die, wherein the thickness of the panel is more than or equal to 6 mm; 2. connecting and fixing the templates with bolts, wherein fixed elastic caulking strips are embedded in the middle of the plate seams; 3. processing the processing width of the flange plate of the edge beam according to the maximum width of curve design parameters, and then matching with an adjustable movable flange plate edge mold; 4. before the template is installed in a field, the template needs to be subjected to rust removal treatment and is coated with a release agent; 5. and (4) installing, connecting and fixing the side die, the bottom die and the end die.
Preferably, when the hogging moment zone corrugated pipe is installed in the step e, the corrugated pipe is reserved at the end of the template for upper bridge connection.
Preferably, the concrete pouring in the step f adopts a continuous pouring mode of oblique segmentation and horizontal layering, and the interval time of the front layer concrete and the rear layer concrete does not exceed the initial setting time;
the beam concrete is vibrated by adopting an attached vibrator and an inserted vibrating bar which are matched together; when the concrete at the water chestnut part enters a mold, starting the attached vibrators at the corresponding positions, and vibrating until the concrete is compact; when the web plate and the upper wing plate concrete are poured, the inserted vibrating rods are mainly used for vibrating, and the dense reinforcing steel bars and the dense corrugated pipes are matched with the attached vibrators for vibrating.
Preferably, the step f further comprises the steps of after the pouring of the concrete of the beam body is finished, polishing the beam top by using a wooden trowel, performing primary slurry collection treatment before initial setting, and finally napping by using a steel brush or a broom;
during the concrete pouring, the corrugated pipe lining pipes at the beam ribs need to be manually pulled, and the lining pipes are pulled out before the initial setting of the concrete is finished.
Preferably, the curing in the step g comprises the steps of covering the beam pieces with geotextile after napping, watering and curing to prevent surface drying shrinkage cracks, curing by using spraying curing equipment after removing the mold, and performing manual matching curing;
and the form removal comprises the step of removing the form after the strength of the beam concrete meets the form removal strength requirement, wherein the form removal is carried out in a segmented mode in sequence, and the surface of the beam is chiseled immediately after the form removal.
Preferably, in the tensioning process in the step h, an elongation value and a reading of a pressure gauge are recorded, and tensioning control is performed by adopting a double control method of controlling force and the elongation value; and the pore canal is washed clean by clear water before grouting, the front exhaust hole is plugged after thick slurry is discharged for pressure maintaining and slurry supplementing, the pressure stabilizing period of more than or equal to 0.6Mpa is kept, and the pressure stabilizing period time is more than or equal to 2 min.
According to the technical scheme, the traditional boundary beam steel die processing and manufacturing mode is changed, the processing width of the boundary beam flange plate is considered according to the maximum width of a curve design parameter, and the adjustable movable boundary beam edge die is matched, so that a set of universal boundary beam template capable of meeting linear and curve linear requirements is processed and manufactured, a curve boundary beam is prefabricated, and the effect of attractive curve bridge linear is achieved. The method breaks through the conventional process limitation of the cast-in-place construction of the curved bridge, and expands the application range of the prestressed T (hollow slab) beam. And the precast beam template is simple to process and manufacture, strong in universality, simple in construction process, guaranteed in quality and widely applicable to curved bridges with the radius R larger than or equal to 200m, and both linear and curved beam pieces can be produced in a precast mode.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a side form of a curved beam of the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the directional words "inside, outside" and the like included in a term merely represent the orientation of the term in a conventional use state or a colloquial meaning understood by those skilled in the art, and should not be construed as limiting the term.
The invention provides a curve bridge curved beam prefabricating construction method, which comprises the following steps:
step a, mounting beam ribs and transverse partition plate reinforcing steel bars;
b, mounting a corrugated pipe;
c, installing a template;
d, mounting panel steel bars;
step e, mounting a hogging moment corrugated pipe;
f, pouring concrete;
step g, maintaining and removing the mold;
step h, prestress tension and grouting; wherein,
and a lining pipe is arranged in the corrugated pipe in a penetrating way and is used for preventing slurry leakage from influencing tension.
During reinforcing bar processing and installation, the reinforcing bar is unified at reinforcing bar processing canopy and is made processing, strictly according to design drawing and standard requirement to its model, size, appearance quality inspect, pay attention to the reinforcing bar length of boundary beam curve change section during the unloading.
The steel bar is bound strictly according to the drawing during installation, the steel bar position line is marked on the base, the steel bar is placed according to the line, the longitudinal and transverse intersection is welded as necessary, and the steel bar framework is guaranteed to be stable and vertical. If the pipeline collides with the steel bars, the position of the pipeline is ensured to be unchanged, and the position of the steel bars is properly moved.
The installation of the wave tube must be strictly according to the coordinate location that the design drawing provided and fixed with the positioning reinforcement, and the bellows junction must be inseparable, and the bellows pipe body is undamaged, prevents to leak the thick liquid. When the corrugated pipe in the hogging moment area is installed, the corrugated pipe with a certain length is reserved at the end of the template, so that the corrugated pipe can be smoothly connected after the corrugated pipe is mounted on the bridge. During construction, a lining pipe must be penetrated in the corrugated pipe to prevent slurry leakage from influencing tension.
Template processing and installation include: 1. and a qualified steel structure processing factory is selected for processing, blanking, bending and welding processes are strictly controlled, and the correct structural size of each part of the beam body and the accurate position of the embedded part are ensured. The templates are assembled by large-block shaped steel moulds, the thickness of the panel is not less than 6mm, the templates are connected by bolts, and fixed elastic caulking strips are embedded in the middle of plate joints, so that the slurry leakage is avoided and the beam body is attractive.
2. The curved beam is processed and manufactured into a set of general boundary beam templates capable of meeting linear and curved line type requirements by changing the traditional boundary beam steel die processing and manufacturing mode, considering the processing width of the boundary beam flange plate according to the maximum width of curve design parameters and matching with an adjustable movable boundary plate side die, wherein the curved beam side die templates are shown in figures 1 and 2.
3. After the template enters a field, the template is subjected to rust removal treatment and a release agent is brushed, the template is required to be accurate in position and tight in connection during installation, and the side mold, the bottom mold and the end mold are closely attached without slurry leakage. When the beam piece is provided with the cross slope, the beam wing plate must be prefabricated according to the cross slope. The embedded parts are accurately arranged, particularly whether the support steel plate is arranged horizontally, and the upper and lower pull rods, and the cushion parts and the fasteners supported on the template are not complete.
In concrete pouring, the concrete pouring method specifically comprises the following steps:
1. pouring concrete is carried out after the acceptance of the steel bars and the templates is qualified, the concrete is uniformly mixed by a mixing station, the mixing proportion and the mixing time are strictly controlled, a tester follows up with the work, the concrete is poured by a continuous pouring mode of oblique segmentation and horizontal layering, and the interval time of the front layer concrete and the rear layer concrete does not exceed the initial setting time;
2. the beam concrete is vibrated by adopting the cooperation of an attached vibrator and an inserted vibrating bar. When the concrete at the horseshoe part enters the mold, the attached vibrators at the corresponding positions are started, the vibration is carried out until the concrete is compact, and the air vibration template is strictly forbidden. When the web plate and the upper wing plate concrete are poured, the inserted vibrating rods are mainly used for vibrating, and the dense reinforcing steel bars and the dense corrugated pipes are matched with the attached vibrators for vibrating. Concrete is vibrated generally until the concrete does not sink any more and no obvious air bubbles rise, and thin cement paste appears on the surface of the concrete and has uniform appearance and plane;
3. the temperature of the concrete mixture during construction in summer should not exceed 32 degrees, when the temperature exceeds 32 degrees, effective measures for reducing temperature and preventing evaporation should be adopted, and the templates and the reinforcing steel bars which are in contact with the concrete should be reduced to below 32 degrees by adopting effective measures before pouring;
4. after the concrete of the beam body is poured, a wooden trowel is adopted to polish the beam top, the primary slurry collection treatment is carried out before the initial setting, and finally a steel brush or a broom is used for napping;
5. during the concrete pouring, the corrugated pipe lining pipes at the beam ribs need to be manually drawn, and before the initial setting of the concrete is finished, the lining pipes are drawn out;
6. the prefabrication of beam piece will have the health preserving test block of same condition, and the test block will be placed on beam piece roof, with this beam piece simultaneously, with the health preserving of condition.
In maintenance and form removal, the beam pieces are covered with geotextile after napping, watering maintenance is carried out to prevent surface shrinkage cracks, special spraying maintenance equipment is used for maintenance after the form removal, manual cooperation maintenance is carried out, the maintenance time is not less than 7 days, and the concrete surface is ensured to be always in a wet state every day. When the temperature is lower than 5 degrees, the concrete surface is covered and heat-preserved, and water cannot be sprayed on the concrete surface.
And after the strength of the beam concrete reaches the requirement of the form removal strength, the form removal can be carried out. The formwork is dismantled in sections in sequence during formwork dismantling, loose or suspended formworks cannot be left, hard smashing or mechanical large-area pushing is strictly forbidden, local deformation of the formworks or damage to concrete edges and corners of the beam body are avoided, the formworks are hoisted in a balanced mode, and the beam body and adjacent formworks are prevented from being damaged. And after the template is dismantled, the surface of the beam body is chiseled immediately.
In the prestressed tensioning and grouting process, the steel strand and the anchor clamp have delivery qualification certificates, can be used after passing the test, and the jack and a matched oil pump are calibrated in time. And calculating corresponding elongation and oil meter reading according to the test data.
Tensioning is required to be carried out after the strength of the T-shaped beam reaches 90% of the design strength and the age of the concrete is not less than 10d, so that tensioning can be carried out and grouting can be carried out in time. Under the condition that the beam camber meets the design requirement, the concrete tension age can be properly shortened according to factors such as air temperature, beam storage time and the like, but the shortest age is not less than 7 d.
In the tensioning process, the elongation value and the reading of a pressure gauge are recorded in detail, the tension control is carried out by adopting a double control method of controlling force and controlling the elongation value, if the actual elongation value and the theoretical elongation value exceed +/-6%, the tensioning can be continued after the reason is found out and measures are taken.
The pore canal is flushed completely by clear water before grouting, grouting is carried out slowly, uniformly and continuously, and after thick slurry is discharged, the front exhaust hole is plugged to maintain pressure and supplement the slurry, a pressure stabilization period not less than 0.6Mpa is kept, the pressure stabilization period is not less than 2min, and water leakage and slurry leakage phenomena are avoided, so that slurry in the pipeline is compact.
According to the technical scheme, the traditional boundary beam steel die processing and manufacturing mode is changed, the processing width of the boundary beam flange plate is considered according to the maximum width of the curve design parameter, and the adjustable movable boundary beam edge die is matched, so that a set of universal boundary beam template capable of meeting the linear requirements of straight lines and curves is processed and manufactured, the curve boundary beam is prefabricated, and the effect of attractive linear of the curve bridge is achieved. The method breaks through the conventional process limitation of the cast-in-place construction of the curved bridge, and expands the application range of the prestressed T (hollow slab) beam. And the precast beam template is simple to process and manufacture, strong in universality, simple in construction process, guaranteed in quality and widely applicable to curved bridges with the radius R larger than or equal to 200m, and both linear and curved beam pieces can be produced in a precast mode.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A curve bridge curved beam prefabricating construction method is characterized by comprising the following steps:
step a, mounting beam ribs and transverse partition plate reinforcing steel bars;
b, mounting a corrugated pipe;
c, installing a template;
d, mounting panel steel bars;
step e, mounting a hogging moment corrugated pipe;
f, pouring concrete;
step g, maintaining and removing the mold;
step h, prestress tension and grouting; wherein,
and a lining pipe is arranged in the corrugated pipe in a penetrating way and is used for preventing slurry leakage from influencing tension.
2. The curved bridge curved beam prefabricating construction method of claim 1, wherein the step a comprises the steps of binding reinforcing steel bars according to a drawing, marking reinforcing steel bar position lines on a base, placing the reinforcing steel bars according to the lines, and welding and fixing the longitudinal and transverse intersections; wherein,
the position of the pipeline is ensured to be unchanged at the collision position of the pipeline and the steel bar, and the position of the steel bar is moved.
3. The method for prefabricating the curved bridge and curved beam of claim 1, wherein the step b comprises positioning the corrugated pipe according to the coordinates on the drawing and fixing the corrugated pipe with the positioning steel bars.
4. The method for prefabricating a curved bridge and curved beam according to claim 1, wherein step c includes: 1. assembling the template by using a shaped steel die, wherein the thickness of the panel is more than or equal to 6 mm; 2. connecting and fixing the templates with bolts, wherein fixed elastic caulking strips are embedded in the middle of the plate seams; 3. processing the processing width of the flange plate of the edge beam according to the maximum width of curve design parameters, and then matching with an adjustable movable flange plate edge mold; 4. before the template is installed in a field, the template needs to be subjected to rust removal treatment and is coated with a release agent; 5. and (4) installing, connecting and fixing the side die, the bottom die and the end die.
5. The prefabrication construction method of the curved bridge curved beam according to claim 1, wherein a corrugated pipe is reserved at the end of the formwork for upper bridge connection when the hogging moment region corrugated pipe is installed in the step e.
6. The curved bridge curved beam prefabrication construction method according to claim 1, wherein the concrete pouring in step f adopts an oblique segmentation and horizontal layering continuous pouring mode, and the interval time of the front layer concrete and the rear layer concrete does not exceed the initial setting time;
the beam concrete is vibrated by adopting an attached vibrator and an inserted vibrating bar which are matched together; when the concrete at the water chestnut part enters a mold, starting the attached vibrators at the corresponding positions, and vibrating until the concrete is compact; when the web plate and the upper wing plate concrete are poured, the inserted vibrating rods are mainly used for vibrating, and the dense reinforcing steel bars and the dense corrugated pipes are matched with the attached vibrators for vibrating.
7. The method for prefabricating the curved bridge and curved beam according to claim 6, wherein the step f further comprises the steps of finishing the beam top by using a wooden trowel after the concrete of the beam body is poured, performing slurry recovery treatment again before initial setting, and finally napping by using a steel brush or a broom;
during the concrete pouring, the corrugated pipe lining pipes at the beam ribs need to be manually pulled, and the lining pipes are pulled out before the initial setting of the concrete is finished.
8. The method for prefabricating the curved bridge curved beam according to claim 1, wherein the curing in the step g comprises the steps of covering the beam piece with geotextile after napping, watering for curing to prevent surface drying shrinkage cracks, curing by using spraying curing equipment after removing a mold, and performing manual matching curing;
and the form removal comprises the step of removing the form after the strength of the beam concrete meets the form removal strength requirement, wherein the form removal is carried out in a segmented mode in sequence, and the surface of the beam is chiseled immediately after the form removal.
9. The curved bridge curved beam prefabrication construction method according to claim 1, wherein in the step h, an elongation value and a pressure gauge reading are recorded in the tensioning process, and the tensioning control is performed by adopting a double control method of controlling force and controlling the elongation value; and the pore canal is washed clean by clear water before grouting, the front exhaust hole is plugged after thick slurry is discharged for pressure maintaining and slurry supplementing, the pressure stabilizing period of more than or equal to 0.6Mpa is kept, and the pressure stabilizing period time is more than or equal to 2 min.
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| CN201810314286.9A CN108544655A (en) | 2018-04-10 | 2018-04-10 | The curved beam prefabricated construction method of curved bridge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820513A (en) * | 2019-11-22 | 2020-02-21 | 中国电建集团贵阳勘测设计研究院有限公司 | Alignment construction method for diaphragm plate of prefabricated concrete T beam of curved bridge |
| CN111576232A (en) * | 2020-05-29 | 2020-08-25 | 四川路航建设工程有限责任公司 | Linear control construction method for precast beam top plate |
| CN112342934A (en) * | 2020-12-18 | 2021-02-09 | 中交三公局第三工程有限公司 | Construction method of high-stability curve bridge plate |
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| CN110820513A (en) * | 2019-11-22 | 2020-02-21 | 中国电建集团贵阳勘测设计研究院有限公司 | Alignment construction method for diaphragm plate of prefabricated concrete T beam of curved bridge |
| CN111576232A (en) * | 2020-05-29 | 2020-08-25 | 四川路航建设工程有限责任公司 | Linear control construction method for precast beam top plate |
| CN112342934A (en) * | 2020-12-18 | 2021-02-09 | 中交三公局第三工程有限公司 | Construction method of high-stability curve bridge plate |
| CN112342934B (en) * | 2020-12-18 | 2022-04-19 | 中交三公局第三工程有限公司 | Construction method of high-stability curve bridge plate |
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Application publication date: 20180918 |