CN114457682A - Cast-in-place construction method of cast-in-place concrete bridge - Google Patents
Cast-in-place construction method of cast-in-place concrete bridge Download PDFInfo
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- CN114457682A CN114457682A CN202111630964.0A CN202111630964A CN114457682A CN 114457682 A CN114457682 A CN 114457682A CN 202111630964 A CN202111630964 A CN 202111630964A CN 114457682 A CN114457682 A CN 114457682A
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- 239000004567 concrete Substances 0.000 title claims abstract description 190
- 238000010276 construction Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 claims abstract description 58
- 238000009432 framing Methods 0.000 claims abstract description 34
- 238000013461 design Methods 0.000 claims abstract description 29
- 238000009415 formwork Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims description 67
- 238000007789 sealing Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000005489 elastic deformation Effects 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 10
- 230000036571 hydration Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
Abstract
The invention provides a cast-in-place construction method of a cast-in-place concrete bridge, and relates to the technical field of building construction. The cast-in-place construction method of the cast-in-place concrete bridge comprises the following steps: erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, then installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation according to the sequence from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after a bottom formwork of 5-10 m is poured, completing pouring of a web plate in a layering mode, and after pouring of the bottom formwork and the web plate in the previous section is completed, circularly constructing until concrete pouring of all structures is completed. The construction method can ensure the construction quality of the box girder, obviously shorten the pouring construction period of the box girder and accelerate the construction efficiency.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a cast-in-place construction method of a cast-in-place concrete bridge.
Background
In modern buildings, particularly in the construction of modern highways and railways, all large concrete bridges are usually constructed by a cast-in-place construction method. The box girder is one of middle girders in bridge engineering, the inner part of the box girder is hollow, and flanges are arranged on two sides of the upper part of the box girder and are similar to boxes, so that the box girder is named. Single boxes, multiple boxes, etc. The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder. The box girder prefabricated in the independent site can be erected after the lower project is finished by combining the bridge girder erection machine, so that the project progress can be accelerated, and the construction period can be saved; cast-in-place box girders are mostly used for large continuous bridges. The common materials are divided into two types, namely a prestressed reinforced concrete box girder and a steel box girder. The prestressed reinforced concrete box girder is constructed on site, and transverse prestress is also arranged in some cases besides longitudinal prestress; the steel box girder is generally processed in a factory and then transported to a site for installation, and has an all-steel structure and a partially reinforced concrete pavement layer. Before the box girder is cast, a concrete foundation needs to be constructed below a concrete bridge needing to be cast, then a cast-in-place full-hall support is erected on the foundation between two adjacent pier columns, a cast-in-place girder bottom formwork is laid on the upper portion of the full-hall support, and then casting is carried out. The existing box girder pouring construction method is adopted, and the construction period is long in general in order to ensure the construction safety and the bridge quality, so that a cast-in-place construction method capable of shortening the construction period while ensuring the box girder quality is needed.
Disclosure of Invention
The invention aims to provide a cast-in-place construction method of a cast-in-place concrete bridge, which can obviously shorten the pouring construction period of a box girder and accelerate the construction efficiency while ensuring the construction quality of the box girder.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The embodiment of the application provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps: measuring a bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing; erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after finishing pouring of a bottom template of 5-10 m, finishing pouring of a web plate in a layering mode, after finishing pouring of a previous section of bottom template and the web plate, circularly constructing until finishing concrete pouring forming methods of all structures, then carrying out secondary concrete pouring, and adopting full-section sequential pouring to carry out top plate pouring.
In some embodiments of the present invention, a foundation treatment is required before the full framing of the support frame.
In some embodiments of the present invention, the pre-pressing and adjusting of the full-framing specifically includes the following steps:
selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stable, the sand bags are removed in layers, the elevations of the bottom die and the foundation are measured after the sand bags are removed, and the elastic deformation of the support and the foundation is calculated.
In some embodiments of the present invention, when the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-framing support is decreased or the shear braces are added to improve the overall stability of the full-framing support.
In some embodiments of the invention, the cast concrete is vibrated during the above-described casting of the concrete, using both the attachment vibrator and the insertion vibrator to vibrate the concrete.
In some embodiments of the present invention, the concrete flowing into the bottom form is smoothed while the bottom form is poured.
7. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 1, characterized in that when the web plates are cast in layers, the layer height of the concrete is less than or equal to 1/2 web plate height.
In some embodiments of the present invention, after the three times of pouring are completed, the concrete reaches a final set state for 20 to 24 hours, and then a chiseling operation is performed to clean floating slurry on the surface of the concrete.
In some embodiments of the present invention, after the concrete at the two positions of the bottom formwork and the web plate is finally set, a covering measure is taken to cover the concrete, and a proper amount of water is sprayed.
In some embodiments of the invention, the method further comprises tensioning, grouting and anchor sealing, after the concrete pouring is completed, the prestress tensioning is performed in time after the concrete strength reaches the strength allowed by the design, the tensioning parameters are strictly performed according to the design requirements, grouting and end sealing are performed in time after the tensioning is completed, grouting is performed by adopting a vacuum auxiliary grouting method, and after the end sealing, waterproof paint is required to be coated on the surface of each part.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps: measuring a bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing; erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after finishing pouring of a bottom template of 5-10 m, finishing pouring of a web plate in a layering mode, after finishing pouring of a previous section of bottom template and the web plate, circularly constructing until finishing concrete pouring forming methods of all structures, then carrying out secondary concrete pouring, and adopting full-section sequential pouring to carry out top plate pouring. Among the worker is pour at present to current case roof beam, choose for use full hall support construction method when pouring at present, need build full hall support earlier, and carry out the pre-compaction on full hall support, a large amount of sand bags of pre-compaction generally need to be carried, pile up the sand bag on full hall support, this in-process is because full hall support is built for the bracing piece, consequently should not place the sand bag, also inconvenient transportation, need lay the backup pad on full hall support, then carry out pre-compaction work again, install each template after pre-compaction work is accomplished again, a large amount of engineering time has been wasted. In the invention, after the full framing is finished, the floor formwork is firstly installed and is used as a structure for bearing the sand bag. The weight of the floor formwork is only required to be subtracted in the calculation of the weight of the sand bag by using the floor formwork as the supporting plate. After the sand bag is pre-pressed and adjusted, the sand bag can be removed, and then other templates can be installed. The steps avoid the problem that time is wasted when the supporting plate is built and detached. The first-time pouring concrete mainly follows a layering dislocation method, the box girder pouring belongs to large-volume concrete pouring, and the layering dislocation pouring can prevent cement hydration heat from being concentrated and overlarge to generate temperature cracks. The hydration heat peak can also be reduced by layered and staggered pouring, and the heat dissipation is convenient. Meanwhile, the staggered pouring can accelerate the pouring time, and the construction can be further accelerated. The second pouring adopts a full-section sequential pouring forming method, so that the box girder is beautiful, and concrete joints are reduced.
Therefore, the cast-in-place construction method of the cast-in-place concrete bridge can obviously shorten the casting construction period of the box girder and accelerate the construction efficiency while ensuring the construction quality of the box girder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
The invention provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps: measuring a bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing; erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after finishing pouring of a bottom template of 5-10 m, finishing pouring of a web plate in a layering mode, after finishing pouring of a previous section of bottom template and the web plate, circularly constructing until finishing concrete pouring forming methods of all structures, then carrying out secondary concrete pouring, and adopting full-section sequential pouring to carry out top plate pouring. Among the worker is pour at present to current case roof beam, choose for use full hall support construction method when pouring at present, need build full hall support earlier, and carry out the pre-compaction on full hall support, a large amount of sand bags of pre-compaction generally need to be carried, pile up the sand bag on full hall support, this in-process is because full hall support is built for the bracing piece, consequently should not place the sand bag, also inconvenient transportation, need lay the backup pad on full hall support, then carry out pre-compaction work again, install each template after pre-compaction work is accomplished again, a large amount of engineering time has been wasted.
In the invention, after the full framing is finished, the floor formwork is firstly installed and is used as a structure for bearing the sand bag. The weight of the floor formwork is only required to be subtracted in the calculation of the weight of the sand bag by using the floor formwork as the supporting plate. After the sand bag is pre-pressed and adjusted, the sand bag can be removed, and then other templates can be installed. The steps avoid the problem that time is wasted when the supporting plate is built and detached.
In the embodiment, the first pouring of concrete mainly follows a layering and dislocation method, the box girder pouring belongs to large-volume concrete pouring, and the layering and dislocation pouring can prevent the cement hydration heat from being concentrated and overlarge to generate temperature cracks. The hydration heat peak can also be reduced by layered and staggered pouring, and the heat dissipation is convenient. Meanwhile, the staggered pouring can accelerate the pouring time, and the construction can be further accelerated. The second pouring adopts a full-section sequential pouring forming method, so that the box girder is beautiful, and concrete joints are reduced.
Therefore, the cast-in-place construction method of the cast-in-place concrete bridge can obviously shorten the casting construction period of the box girder and accelerate the construction efficiency while ensuring the construction quality of the box girder.
In this embodiment, the foundation treatment is required before the full framing. The foundation is processed mainly by replacing, filling and compacting, a concrete strip foundation, a pile foundation concrete beam and other modes, and the smoothness and stability of the foundation are guaranteed.
In this embodiment, the pre-pressing and adjusting of the full-framing support specifically includes the following steps: selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stable, the sand bags are removed in layers, the elevations of the bottom die and the foundation are measured after the sand bags are removed, and the elastic deformation of the support and the foundation is calculated. The sand bag is convenient to carry, convenient to obtain materials and capable of saving cost. The sand bag is loaded on the bottom template for three times, so that the pre-pressing work can be stably completed, and meanwhile, the destructive deformation caused by adding the sand bag at one time can be prevented. The sand bag loading sequence is carried out according to the concrete pouring sequence, the weight and the pouring position of the concrete in the pouring process are completely simulated, the pouring process can be simulated to the maximum extent, and the prepressing result is more accurate.
In this embodiment, when the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear force is increased to improve the overall stability of the full-space support. When above-mentioned pre-compaction unstability, arrange the interval or increase the shear force through the pole setting that changes full hall support and prop the overall stability who improves full hall support, can effectual adjustment full hall support to the pressure that needs bear after the adaptation concrete placement.
In this embodiment, the cast concrete is vibrated during the above-described casting of the concrete, and the attached vibrator and the inserted vibrator are used to vibrate the concrete. And (4) reserving a person in the beam during pouring, and leveling the concrete flowing into the bottom plate. Concrete is vibrated using both attached and inserted vibrators. The vibrator vibrates the concrete to make the concrete compact and combined, and eliminate the phenomena of honeycomb pitted surface and the like of the concrete so as to improve the strength of the concrete and ensure the quality of concrete members.
In this embodiment, when the bottom form is poured, the concrete flowing into the bottom form is leveled. The elevation of the beam top is strictly controlled in the pouring process, and the beam top surface is leveled and compacted.
In the embodiment, when the web plates are poured in a layered mode, the layer height of the concrete is less than or equal to 1/2 web plate height. The layer height of the concrete is not more than 1/2 web height, the concrete layer with the thickness is convenient to construct, and the quality of the bridge is influenced by the problems that the concrete cracks and the like under the thickness adjustment.
In this embodiment, after the three times of pouring are completed and the concrete reaches the final set state for 20 to 24 hours, a chiseling operation is performed to clean the floating slurry on the surface of the concrete. Because the new and old concrete is combined, a construction joint is formed at the combined position, the continuity of the concrete structure is influenced, and the bending resistance and the shearing resistance are not favorable. When bending is performed, the parts may be dislocated from each other. If the surface is not in a plane, the phenomenon of dislocation is improved; it is more advantageous for shearing resistance because the new and old concrete joints are not a smooth plane and have the resistance of interdigitation, which is not easy to damage. The reason for chiseling is mainly to chiseling floating slurry on the surface of concrete, so that the concrete at the new and old joints is compact and firm in combination.
In this embodiment, after the concrete in the two positions of the bottom form and the web plate is finally set, a covering measure is taken to cover the concrete, and a proper amount of water is sprayed. After the concrete layer is poured is covered by a covering measure, in order to guarantee the strength of the concrete and prevent the concrete from generating cracks due to surface drying, the concrete needs to be cured, and watering is one of methods for naturally curing the concrete. Within 12 hours after the concrete is poured at normal temperature, the concrete must be covered for heat preservation and maintenance, the ordinary cement is not less than 7 days, if the watering and maintenance of the concrete are neglected, on one hand, the strength of the concrete is reduced, and on the other hand, the concrete cannot supplement water in the hardening process, so that a large amount of water is lacked, and cracks are generated.
In this embodiment, the above steps further include tensioning, grouting, and sealing the anchor after the pouring is completed, and the concrete is poured. And (3) carrying out prestress tensioning after the concrete strength reaches the strength allowed by design, wherein the tensioning parameters are strictly carried out according to the design requirements. Grouting and end sealing are carried out in time after tensioning is finished, grouting is carried out by adopting a vacuum auxiliary grouting method, and waterproof paint is required to be coated on the surface of each part after end sealing. Wherein the tensioning is to provide a pre-stress. The beam is pre-tensioned to produce a negative moment in the span, partially counteracting the positive moment of the beam in use, acting as a prestressed beam. Wherein, above-mentioned mud jacking and anchor sealing can both play the effect of preventing the corrosion.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps:
1) and measuring the bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing.
2) Then carry out ground treatment, erect full hall support, at full hall support installation die block board in proper order according to the bridge design drawing to carry out pre-compaction and adjustment to full hall support, then install web and centre form on the die block board, and install framework of steel reinforcement. The prepressing and adjusting of the full framing specifically comprises the following steps: selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stable, the sand bags are removed in layers, the elevations of the bottom die and the foundation are measured after the sand bags are removed, and the elastic deformation of the support and the foundation is calculated. When the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear force is increased to improve the overall stability of the full-space support.
3) The concrete pouring method comprises the steps of sequentially carrying out concrete pouring operation according to the sequence from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, pouring a bottom template of 5m, then pouring a web plate in layers, circularly constructing after pouring of the last section of bottom template and the web plate is completed until concrete pouring of all structures is completed, then carrying out concrete pouring for the second time, and pouring a top plate by adopting a full-section sequential pouring forming method. During the concrete pouring, the concrete to be poured is vibrated, the attached vibrator and the inserted vibrator are used for vibrating the concrete, and the concrete flowing into the bottom formwork is smoothed when the bottom formwork is poured. When the webs are poured in a layered mode, the layer height of the concrete is less than or equal to 1/2 web height.
4) And after the third pouring is finished and the concrete reaches the final setting state for 20 hours, performing chiseling operation and cleaning the laitance on the surface of the concrete. Then after the concrete at the bottom template and the web plate is finally set, covering measures are taken to cover the concrete, and a proper amount of water is sprayed. And (3) timely maintaining after concrete pouring is finished, ensuring that the surface of the concrete is completely wet and maintained for more than 14 days, carefully executing maintenance work, monitoring various indexes of the suspected soil surface every day by a construction unit, particularly monitoring the temperature and the humidity, recording day data, and needing to timely remedy once problems occur.
5) Tensioning, grouting and anchor sealing, wherein after concrete pouring is finished, prestress tensioning is timely performed after the concrete strength reaches the strength allowed by design, tensioning parameters are strictly performed according to the design requirements, grouting and end sealing are timely performed after tensioning is finished, grouting is performed by a vacuum auxiliary grouting method, and after end sealing, waterproof paint needs to be coated on the surface of each part, so that the influence on rain and snow weather is avoided.
Example 2
The embodiment provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps:
1) and measuring the bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing.
2) Then carry out ground treatment, erect full hall support, at full hall support installation die block board in proper order according to the bridge design drawing to carry out pre-compaction and adjustment to full hall support, then install web and centre form on the die block board, and install framework of steel reinforcement. The prepressing and adjusting of the full framing specifically comprises the following steps: selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stabilized, removing the sand bags in layers, measuring the elevations of the bottom die and the foundation after the sand bags are removed, and calculating the elastic deformation of the support and the foundation. When the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear force is increased to improve the overall stability of the full-space support.
3) The method comprises the following steps of sequentially carrying out concrete pouring operation according to the sequence from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after 7m of bottom templates are poured, completing pouring of webs in a layering mode, after pouring of the last section of bottom templates and the webs is completed, circularly constructing until concrete pouring of all structures is completed, then carrying out secondary concrete pouring, and adopting a full-section sequential pouring forming method to pour a top plate. During the concrete pouring, the poured concrete is vibrated, the attached vibrator and the inserted vibrator are used for vibrating the concrete, and the concrete flowing into the bottom formwork is leveled when the bottom formwork is poured. When the webs are poured in a layered mode, the layer height of the concrete is less than or equal to 1/2 web height.
4) And after the third pouring is finished and the concrete reaches the final setting state for 22 hours, performing chiseling operation and cleaning the laitance on the surface of the concrete. Then after the concrete at the bottom template and the web plate is finally set, covering measures are taken to cover the concrete, and a proper amount of water is sprayed. And (3) timely maintaining after concrete pouring is finished, ensuring that the surface of the concrete is completely wet and maintained for more than 14 days, carefully executing maintenance work, monitoring various indexes of the suspected soil surface every day by a construction unit, particularly monitoring the temperature and the humidity, recording day data, and needing to timely remedy once problems occur.
5) Tensioning, grouting and anchor sealing, wherein after concrete pouring is finished, prestress tensioning is timely performed after the concrete strength reaches the strength allowed by design, tensioning parameters are strictly performed according to the design requirements, grouting and end sealing are timely performed after tensioning is finished, grouting is performed by a vacuum auxiliary grouting method, and after end sealing, waterproof paint needs to be coated on the surface of each part, so that the influence on rain and snow weather is avoided.
Example 3
The embodiment provides a cast-in-place construction method of a cast-in-place concrete bridge, which comprises the following steps:
1) and measuring the bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing.
2) Then carry out ground treatment, erect full hall support, at full hall support installation die block board in proper order according to the bridge design drawing to carry out pre-compaction and adjustment to full hall support, then install web and centre form on the die block board, and install framework of steel reinforcement. The prepressing and adjusting of the full framing specifically comprises the following steps: selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stable, the sand bags are removed in layers, the elevations of the bottom die and the foundation are measured after the sand bags are removed, and the elastic deformation of the support and the foundation is calculated. When the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear force is increased to improve the overall stability of the full-space support.
3) The method comprises the following steps of sequentially carrying out concrete pouring operation according to the sequence from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after pouring a bottom template of 10m, completing pouring of a web plate in a layering mode, after pouring of the bottom template and the web plate at the previous section is completed, circularly constructing until concrete pouring of all structures is completed, then carrying out concrete pouring for the second time, and adopting a full-section sequential pouring forming method to pour a top plate. During the concrete pouring, the concrete to be poured is vibrated, the attached vibrator and the inserted vibrator are used for vibrating the concrete, and the concrete flowing into the bottom formwork is smoothed when the bottom formwork is poured. When the webs are poured in a layered mode, the layer height of the concrete is less than or equal to 1/2 web height.
4) And after the third pouring is finished and the concrete reaches a final setting state for 24 hours, performing chiseling operation and cleaning the laitance on the surface of the concrete. Then after the concrete at the bottom template and the web plate is finally set, covering measures are taken to cover the concrete, and a proper amount of water is sprayed. And (3) timely maintaining after concrete pouring is finished, ensuring that the surface of the concrete is completely wet and maintained for more than 14 days, carefully executing maintenance work, monitoring various indexes of the suspected soil surface every day by a construction unit, particularly monitoring the temperature and the humidity, recording day data, and needing to timely remedy once problems occur.
5) Tensioning, grouting and anchor sealing, wherein after concrete pouring is finished, prestress tensioning is timely performed after the concrete strength reaches the strength allowed by design, tensioning parameters are strictly performed according to the design requirements, grouting and end sealing are timely performed after tensioning is finished, grouting is performed by a vacuum auxiliary grouting method, and after end sealing, waterproof paint needs to be coated on the surface of each part, so that the influence on rain and snow weather is avoided.
Comparative example 1
Comparative example 1 the construction schemes of example 1, example 2 and example 3 were installed respectively to simulate bridge construction, and the simulated construction adopted 1: the bridge is reduced by 20. Example 1, the construction took 49 hours, wherein the box girder casting took 24 hours; example 2 the construction took 50 hours total, wherein the box girder pouring took 26 hours; example 3 construction took 52 hours total, with box beam pouring taking 24 hours.
Comparative example 2
This comparative example 2 provides a cast-in-place construction method of a cast-in-place concrete bridge, which is a method of performing box girder construction in a certain construction unit during bridge construction, except for step 2), and the other steps are substantially the same as those in embodiment 1 of the present invention, and the difference is that step 2) is:
2) then carry out ground treatment, erect full hall support, lay the backup pad on full hall support to carry out pre-compaction and adjustment to full hall support in the backup pad, then according to bridge design drawing at full hall support installation die block board in proper order, then install web and centre form on the die block board, and install framework of steel reinforcement. The prepressing and adjusting of the full framing specifically comprises the following steps: selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stabilized, removing the sand bags in layers, measuring the elevations of the bottom die and the foundation after the sand bags are removed, and calculating the elastic deformation of the support and the foundation. When the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear force is increased to improve the overall stability of the full-space support.
In the construction process, a simulation construction mode is adopted, the construction of the bridge designed in the same way as the comparative example 1 is completed by utilizing the simulation construction method for adopting the cast-in-place concrete bridge provided by the comparative example 2, and the construction also comprises the following steps of 1: the bridge is reduced by 20. The construction takes 68 hours, and the pouring of the box girder takes 32 hours.
Through comparison of the construction time of the comparative example 1 and the construction time of the comparative example 2, it is obvious that the construction time of the bridge which is cast by the cast-in-place construction method of the cast-in-place concrete bridge provided by the invention in the comparative example 1 is obviously shorter than the construction time of the bridge which is cast by the cast-in-place construction method of the common cast-in-place concrete bridge in the comparative example 2, and the casting time of the box girder is obviously shortened. Therefore, the cast-in-place construction method of the cast-in-place concrete bridge can obviously shorten the construction time of the bridge and improve the construction efficiency.
In summary, the cast-in-place construction method for the cast-in-place concrete bridge according to the embodiment of the invention includes the following steps: measuring a bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing; erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after finishing pouring of a bottom template of 5-10 m, finishing pouring of a web plate in a layering mode, after finishing pouring of a previous section of bottom template and the web plate, circularly constructing until finishing concrete pouring forming methods of all structures, then carrying out secondary concrete pouring, and adopting full-section sequential pouring to carry out top plate pouring. Among the worker is pour at present to current case roof beam, choose for use full hall support construction method when pouring at present, need build full hall support earlier, and carry out the pre-compaction on full hall support, a large amount of sand bags of pre-compaction generally need to be carried, pile up the sand bag on full hall support, this in-process is because full hall support is built for the bracing piece, consequently should not place the sand bag, also inconvenient transportation, need lay the backup pad on full hall support, then carry out pre-compaction work again, install each template after pre-compaction work is accomplished again, a large amount of engineering time has been wasted. In the invention, after the full framing is finished, the floor formwork is firstly installed and is used as a structure for bearing the sand bag. The weight of the floor formwork is only required to be subtracted in the calculation of the weight of the sand bag by using the floor formwork as the supporting plate. After the sand bag is pre-pressed and adjusted, the sand bag can be removed, and then other templates can be installed. The steps avoid the problem that the building and the dismounting of the supporting plate can waste time. The first-time pouring concrete mainly follows a layering dislocation method, the box girder pouring belongs to large-volume concrete pouring, and the layering dislocation pouring can prevent cement hydration heat from being concentrated and overlarge to generate temperature cracks. The hydration heat peak can also be reduced by layered and staggered pouring, and the heat dissipation is convenient. Meanwhile, the staggered pouring can accelerate the pouring time, and the construction can be further accelerated. The second pouring adopts a full-section sequential pouring forming method, so that the box girder is beautiful, and concrete joints are reduced. Therefore, the cast-in-place construction method of the cast-in-place concrete bridge can obviously shorten the casting construction period of the box girder and accelerate the construction efficiency while ensuring the construction quality of the box girder.
The embodiments described above are some, not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A cast-in-place construction method of a cast-in-place concrete bridge is characterized by comprising the following steps: measuring a bridge construction site, determining a cast-in-place construction scheme according to the measurement data, and drawing a support construction drawing; erecting a full-framing support, sequentially installing a bottom template on the full-framing support according to a bridge design drawing, prepressing and adjusting the full-framing support, installing a web plate and an inner mold on the bottom template, and installing a steel reinforcement framework; the method comprises the steps of sequentially carrying out concrete pouring operation from low to high, firstly pouring concrete for the first time in the pouring process, adopting a layering dislocation method, after finishing pouring of a bottom template of 5-10 m, finishing pouring of a web plate in a layering mode, after finishing pouring of a previous section of bottom template and the web plate, circularly constructing until finishing concrete pouring forming methods of all structures, then carrying out secondary concrete pouring, and adopting full-section sequential pouring to carry out top plate pouring.
2. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 1, wherein foundation treatment is required before the full framing of the full framing.
3. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 2, wherein the pre-pressing and adjusting of the full framing specifically comprises the following steps:
selecting sand bags weighed according to standard weight, loading the sand bags on a bottom template, loading the quantity and the positions of the sand bags according to the design dead weight of a bridge, and carrying out sand bag loading according to the concrete pouring sequence in three times; and after the support is stable, the sand bags are removed in layers, the elevations of the bottom die and the foundation are measured after the sand bags are removed, and the elastic deformation of the support and the foundation is calculated.
4. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 3, wherein when the pre-pressing is unstable, the arrangement distance of the vertical rods of the full-space support is reduced or the shear support is increased to improve the overall stability of the full-space support.
5. The cast-in-place construction method of a cast-in-place concrete bridge according to claim 1, wherein the cast-in-place concrete is vibrated during the casting of the concrete, and the attached vibrator and the inserted vibrator are used to vibrate the concrete.
6. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 1, wherein when the bottom formwork is poured, concrete flowing into the bottom formwork is leveled.
7. The cast-in-place construction method of the cast-in-place concrete bridge of claim 1, wherein when the web plates are cast in layers, the layer height of the concrete is less than or equal to 1/2 web plate height.
8. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 6, wherein after the three times of pouring are finished, the concrete reaches a final set state for 20-24 hours, and then chiseling operation is performed to clean floating slurry on the surface of the concrete.
9. The cast-in-place construction method of the cast-in-place concrete bridge of claim 8, wherein after the concrete at the two positions of the bottom template and the web plate is finally set, a covering measure is adopted to cover the concrete, and a proper amount of water is sprayed.
10. The cast-in-place construction method of the cast-in-place concrete bridge according to claim 1, characterized by further comprising tensioning, grouting and anchor sealing, wherein after the concrete is poured, the concrete is tensioned in a pre-stressed manner in time after the strength of the concrete reaches the strength allowed by the design, the tensioning parameters are strictly performed according to the design requirements, grouting and end sealing are performed in time after the tensioning is completed, grouting is performed by a vacuum-assisted grouting method, and after the end sealing is performed, the surface of each part needs to be coated with waterproof paint.
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