CN114800848A - Bridge deck precast slab construction process - Google Patents
Bridge deck precast slab construction process Download PDFInfo
- Publication number
- CN114800848A CN114800848A CN202210514085.XA CN202210514085A CN114800848A CN 114800848 A CN114800848 A CN 114800848A CN 202210514085 A CN202210514085 A CN 202210514085A CN 114800848 A CN114800848 A CN 114800848A
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- steel bars
- concrete
- template
- bridge deck
- precast slab
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 239000004567 concrete Substances 0.000 claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000005336 cracking Methods 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 18
- 239000004746 geotextile Substances 0.000 claims description 16
- 238000013461 design Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 13
- 238000009417 prefabrication Methods 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 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
- 238000005259 measurement Methods 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 230000000979 retarding effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000036314 physical performance Effects 0.000 claims description 2
- 238000001723 curing Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 238000004321 preservation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000012615 aggregate Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000007788 roughening Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a bridge deck precast slab construction process which comprises the following steps of a template mould manufacturing stage, a steel bar construction stage, a concrete pouring stage, a concrete curing stage, a mould stripping stage and a precast slab mounting stage. The bridge deck precast slab construction process is subjected to layer-by-layer detection at each stage, and the vibration technology and the concrete curing method in the concrete pouring process are improved, so that the bridge deck precast slab is prevented from cracking and the like.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge deck precast slab construction process.
Background
The prefabricated bridge splicing technology meets the requirements of the times and is widely applied to the bridge erection process.
Compared with cast-in-place concrete components, the prefabricated high-strength concrete prefabricated bridge components manufactured in factories are parallel to site construction tasks, and construction efficiency can be greatly improved.
The bridge deck precast slab is used as a component of a precast bridge member, and is formed by directly hoisting a manufactured and molded concrete bridge deck to a main body of a bridge for splicing installation.
However, the quality problem of the bridge deck precast slab often occurs in the construction process of the existing bridge deck precast slab due to the fact that concrete is not constructed in place in the pouring process.
Disclosure of Invention
The invention aims to solve the problems of the background technology and provides a bridge deck precast slab construction process.
The purpose of the invention can be realized by the following technical scheme:
a bridge deck precast slab construction process comprises the following steps:
s1, template mold manufacturing stage:
manufacturing a mould according to the size of the template required by the bridge design drawing, and checking and accepting the manufactured mould;
s2, steel bar construction:
checking the steel bars, batching the steel bars after checking no errors, transporting the processed steel bars to a construction site after checking no errors, installing the steel bars, preliminarily binding and molding the prefabricated plate steel bar mesh, then placing the prefabricated plate steel bar mesh into a template, and adjusting the distance between the steel bars according to the notch of the template;
s3, concrete pouring stage:
chiseling the bridge deck at the wet joint position, collecting the top surface after the pouring of the prefabricated bridge deck is finished, and finally performing galling treatment by adopting a special galling tool to ensure that the bridge deck and the waterproof layer can be smoothly combined and the concrete is vibrated;
s4, concrete curing stage: covering concrete with geotextile, and watering for curing;
s5, demolding: taking out the prefabricated slab molded in the template;
s6, prefabricated plate installation stage:
the prefabricated plate forming method includes the steps that formed prefabricated plates are checked and accepted, the prefabricated plates with qualified quality are transported to a construction site through a transport tool, the prefabricated plates with qualified quality are hoisted to a bridge floor to be installed, an on-site prefabrication team deals with actual measurement and recording of space intervals between on-site prefabrication cross beams, the prefabrication team performs prefabrication and numbering according to actual measured seam widths, and the prefabricated panels are installed according to corresponding positions and numbering sequences during installation.
As a further scheme of the invention: the inspection reinforcing bar variety, the specification, look over reinforcing bar physical properties data, the inspection reinforcing bar is bent to the force, whether the bend scale ratio data accords with antidetonation grade requirement, batching is carried out the reinforcing bar according to design drawing size, count required reinforcing bar quantity after the batching is accomplished, the reinforcing bar all adopts the iron wire to prick jail when the reinforcing bar is installed, the mid portion reinforcing bar can adopt the interval ligature, should prick silk thread head toward the reinforcing bar side with the hand after the ligature, avoid taking place the silk leakage after pouring, the reinforcing bar interval needs to satisfy "highway bridge culvert maintenance standard" requirement.
As a further scheme of the invention: and (4) checking whether the quality problem of serious corner defect or cracking occurs, if the quality problem occurs, discarding, rechecking the quality of the prefabricated slab after the prefabricated slab is transported to a construction site, and checking whether the prefabricated slab cracks or falls off the corner.
As a further scheme of the invention: still will slot according to the reinforcing bar interval at template mould preparation stage to the mould to ensure that the reinforcing bar interval accords with the designing requirement, the mould adopts design steel form, and the mould is checked and is accepted and should be measured template internal dimension, roughness.
As a further scheme of the invention: when the concrete is vibrated by adopting an inserted vibrator, the inserting distance is 40 cm; the concrete should be vibrated until the concrete stops sinking, no obvious bubbles rise, the surface is flat and consistent, and thin-layer cement paste is presented.
As a further scheme of the invention: spot welding is used for replacing binding in the steel bar installation.
As a further scheme of the invention: the template acceptance is to check whether the inner size, the flatness and the like of the template meet the design requirements, if the template is deformed excessively or damaged, the template mold needs to be adjusted or modified again, and the template mold can be put into use after the acceptance is qualified.
As a further scheme of the invention: mechanical intelligent equipment is adopted for batching the reinforcing steel bars, and the mechanical equipment is provided with a bending machine for bending the reinforcing steel bars; cutting off the steel bar by the cutting machine; straightening the bent steel bars by a straightening machine; the surface of the steel bar should be kept clean, and before concrete pouring, surface oil stains, paint skin, scale rust and the like should be removed.
As a further scheme of the invention: the geotextile covering time is carried out after concrete pouring initial setting, and the geotextile is watered to soak the geotextile to moisturize the concrete after the geotextile covering.
As a further scheme of the invention: when the average temperature is higher than 5 ℃, the covering geotextile is watered and cured within 12 hours after the concrete is poured; the curing time of the concrete mixed by Portland cement, ordinary Portland cement or slag Portland cement is not less than 7 days; the curing time of the concrete with the addition of the retarding admixture, the mineral admixture or the impermeability requirement is not less than 14 days.
The invention has the beneficial effects that:
the bridge deck precast slab construction process is subjected to layer-by-layer detection at each stage, and the vibration technology and the concrete curing method in the concrete pouring process are improved, so that the bridge deck precast slab is prevented from cracking and the like.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
The invention relates to a bridge deck precast slab construction process, which comprises the following steps:
s1, template mold manufacturing stage: manufacturing a mould according to the size of the template required by the bridge design drawing, and checking and accepting the manufactured mould;
in the template mold manufacturing stage, the mold is grooved according to the steel bar spacing so as to ensure that the steel bar spacing meets the design requirement;
the mould adopts a shaping steel template;
the template acceptance is to check whether the inner size, flatness and the like of the template meet the design requirements, if the template is deformed excessively or damaged, the template mold needs to be adjusted or modified again, and the template mold can be put into use after the acceptance is qualified;
in order to conveniently remove the template, lubricating liquid such as a release agent should be coated on the template before concrete pouring.
S2, steel bar construction:
checking the variety and specification of the steel bars, checking the physical performance data of the steel bars, and checking whether the data of the strength to yield ratio and the yield ratio of the steel bars meet the requirement of the earthquake-resistant grade;
wherein, checking whether the filling of the 'material purchasing accessory approach inspection record' is standard, whether the signing is complete, whether the variety and the specification meet the design requirements, and whether the manufacturer is a manufacturer specified by a contract;
wherein, whether the steel bar leaving time and entering time are contradictory is compared to check whether a plurality of quality guarantee certificates are forged or not;
processing the steel bars after checking and determining that the steel bars are correct, batching the steel bars according to the size of a design drawing, and counting the number of the required steel bars after batching is finished;
obvious warning signs are arranged around the reinforcing steel bar in the batching process, irrelevant personnel are forbidden to enter a reinforcing steel bar batching dangerous area, and non-operating personnel are strictly forbidden to touch or use machinery;
the method comprises the following steps of (1) adopting mechanical intelligent equipment to carry out batching on the steel bars, wherein the mechanical equipment comprises a bending machine, a cutting machine, a straightening machine and the like;
wherein, the surface of the steel bar should be kept clean, and surface oil stain, paint skin, scale rust and the like should be removed before concrete pouring;
wherein, the steel bar needs to be straight without local bending, and the coiled steel bar and the bent steel bar are both straightened;
after checking, transporting the processed steel bars to a construction site;
wherein, the transportation adopts a transportation device or manual transportation;
wherein, the transportation device can be a transportation vehicle and the like;
installing the steel bars;
wherein, the 4cm bridge deck precast slab has a layer of steel bar mesh which consists of transverse steel bars and longitudinal steel bars, the transverse steel bars are phi 10mm steel bars, and the longitudinal steel bars are phi 8mm steel bars;
wherein, the reinforcing steel bars of the bridge deck are sequentially a transverse reinforcing steel bar with the diameter of 10mm and a longitudinal reinforcing steel bar with the diameter of 8mm from top to bottom;
the steel bar mesh is fixedly tied by iron wires between the transverse phi 10mm steel bars and the longitudinal phi 8mm steel bars, the steel bars at the middle part can be tied at intervals, and the wire tying heads are conveniently directed to the steel bars after tying, so that wire leakage after pouring is avoided;
wherein, spot welding can be used to replace binding;
firstly, preliminarily binding and forming a prefabricated plate reinforcing mesh, then placing the prefabricated plate reinforcing mesh into a template, and adjusting the distance between reinforcing bars according to the notch of the template so as to ensure that the distance between the reinforcing bars meets the requirement of highway bridge and culvert maintenance standard;
when the distance b between the main beams is less than or equal to 75cm, the longitudinal bridge-direction distance of the transverse phi 10mm steel bars is 10 cm; the longitudinal phi 8mm steel bar transverse bridge spacing is 10 cm;
when the distance between the main beams is more than 75cm and less than or equal to 100cm, the transverse phi 10mm longitudinal bridge spacing of the steel bars is 8 cm; the longitudinal phi 8mm steel bar bridge-direction spacing is 10 cm;
s3, concrete pouring stage:
reinforcing the connection between prefabricated bridge decks and between cast-in-place wet joints, and performing chiseling treatment on the bridge decks at the positions of the wet joints;
after the prefabricated bridge deck is poured, the top surface is collected, and finally a special roughening tool is adopted for roughening treatment to ensure that the bridge deck and the waterproof layer can be smoothly combined;
wherein, the standard bridge deck is made straight by adopting a curve under the condition of larger radius and is connected in sequence at the cast-in-place section;
the concrete production is uniformly produced by a concrete mixing plant forced mixer at a concrete mixing plant, and the concrete is transported to a prefabricated site by a concrete mixing transport vehicle for pouring;
wherein, the bridge deck precast slab adopts C60 concrete, and the used cement, sand, aggregate and water all conform to the regulations of technical Specification for road and bridge construction (JTG/T3650-2020);
wherein, low-alkali cement is adopted, alkali active aggregate is strictly forbidden to be used, and alkali aggregate reaction is avoided.
Vibrating concrete, wherein when the concrete is vibrated by adopting an insertion vibrator, the insertion distance is 40 cm; the concrete should be vibrated until the concrete stops sinking, no obvious bubbles rise, the surface is flat and consistent, and thin-layer cement paste is presented;
s4, concrete curing stage: covering concrete with geotextile, watering and maintaining, wherein the geotextile covering time is carried out after the concrete is poured and initially set, and watering and wetting the geotextile after the geotextile covering to keep moisture of the concrete;
when the average temperature is higher than 5 ℃, the covering geotextile is watered and cured within 12 hours after the concrete is poured;
wherein the curing time of the concrete mixed by Portland cement, ordinary Portland cement or slag Portland cement is not less than 7 days;
wherein, the curing time of the admixture retarding admixture, the mineral admixture or the concrete with impermeability requirement is not less than 14 days;
the watering maintenance frequency is judged according to the humidity state of the concrete;
wherein the water for maintenance can be tap water;
wherein, when the concrete area is larger, water storage maintenance can be adopted;
when the temperature is lower than 5 ℃, watering and curing are not available, and the concrete needs to be subjected to heat preservation treatment to avoid freezing;
wherein, the heat preservation treatment can be to cover a plastic film on the concrete layer, so as to preserve the heat of the concrete while avoiding the water loss;
wherein, the heat preservation treatment can also be that a concrete layer is covered with a heat preservation object, such as a cotton quilt and the like;
wherein, when the temperature is too low, a heating curing mode, such as steam curing, hot film curing and the like, can also be adopted;
s5, demolding: taking out the prefabricated slab molded in the template;
s6, prefabricated plate installation stage:
the formed precast slabs are inspected, whether the quality problem of serious corner defect or cracking occurs is checked, and if the quality problem occurs, the precast slabs are scrapped;
the prefabricated slabs with qualified quality are transported to a construction site through a transport tool, the quality of the prefabricated slabs is rechecked after the prefabricated slabs are transported to the construction site, and whether the prefabricated slabs crack or fall off the angle is checked;
hoisting the precast slabs with qualified quality to the bridge deck;
and the field prefabrication team deals with the actual measurement and recording of the gap distance between the field prefabricated cross beams, performs prefabrication and numbering according to the actual seam width measured, and is installed according to the corresponding position and the numbering sequence during installation.
For example, the No. 2 beam seams from left to right of the No. 2 bridge deck slab of the main line bridge are arranged, the No. 6 cover slabs from the mileage to the mileage are numbered as N (the number of holes) -2 (the number of seams) -6 (the number of the cover slabs).
Before installation, uneven positions exist at the slotted positions of the I-shaped beam surfaces, equal-strength mortar is adopted for leveling, and the precast slabs are attached to the beam surfaces after installation;
during installation, the precast slabs are paved to the beam end flange plate, the width of the flange plate is not less than 2cm, and a gap between the precast slabs and a beam end notch and a gap between longitudinal precast slabs are filled with putty;
after the prefabricated plate is installed in the clamping groove, the thickness of the bridge deck plate is required to be adjusted when the prefabricated plate is higher than the I-shaped beam surface and is not larger than 3cm, and the thickness of the bridge deck plate is required to be adjusted when the prefabricated plate is higher than 3cm, so that the construction thickness of the bridge deck plate is ensured.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A bridge deck precast slab construction process is characterized by comprising the following steps:
s1, template mold manufacturing stage:
manufacturing a mould according to the size of the template required by the bridge design drawing, and checking and accepting the manufactured mould;
s2, steel bar construction:
checking the steel bars, batching the steel bars after checking the steel bars, transporting the processed steel bars to a construction site after checking the steel bars, installing the steel bars, preliminarily binding and forming the prefabricated plate steel bar mesh, then placing the prefabricated plate steel bar mesh into a template, and adjusting the interval between the steel bars according to the notch of the template;
s3, concrete pouring stage:
chiseling the bridge deck at the wet joint position, collecting the top surface after the pouring of the prefabricated bridge deck is finished, and finally performing galling treatment by adopting a special galling tool to ensure that the bridge deck and the waterproof layer can be smoothly combined and the concrete is vibrated;
s4, concrete curing stage: covering concrete with geotextile, and watering for curing;
s5, demolding: taking out the prefabricated slab molded in the template;
s6, prefabricated plate installation stage:
the prefabricated plate forming method includes the steps that formed prefabricated plates are checked and accepted, the prefabricated plates with qualified quality are transported to a construction site through a transport tool, the prefabricated plates with qualified quality are hoisted to a bridge floor to be installed, an on-site prefabrication team deals with actual measurement and recording of space intervals between on-site prefabrication cross beams, the prefabrication team performs prefabrication and numbering according to actual measured seam widths, and the prefabricated panels are installed according to corresponding positions and numbering sequences during installation.
2. The bridge deck precast slab construction process according to claim 1, wherein the variety and specification of steel bars are checked, the physical performance data of the steel bars are checked, whether the yield ratio and the yield ratio data of the steel bars meet the requirement of the anti-seismic grade is checked, the steel bars are proportioned according to the size of a design drawing, the number of the required steel bars is counted after the proportioning is completed, the steel bars are all firmly tied by using iron wires during the installation, the steel bars in the middle part can be tied at intervals, the heads of tie wires are manually led to the sides of the steel bars after the tying, the wire leakage after the pouring is avoided, and the intervals of the steel bars need to meet the requirement of highway bridge culvert maintenance specification.
3. The construction process of the bridge deck precast slab according to claim 1, wherein when the formed precast slab is inspected, whether the quality problem of serious corner defect or cracking occurs is checked, if the quality problem is rejected, the quality of the precast slab needs to be rechecked after the precast slab is transported to a construction site, and whether the precast slab cracks or falls off the corner is checked.
4. The construction process of the bridge deck precast slab according to claim 1, characterized in that the die is grooved according to the steel bar spacing in the manufacturing stage of the template die to ensure that the steel bar spacing meets the design requirements, the die adopts a shaped steel template, and the die is checked to measure the internal dimension and the flatness of the template.
5. The process of claim 1, wherein the concrete is vibrated by an insertion vibrator, the insertion distance is 40 cm; the concrete should be vibrated until the concrete stops sinking, no obvious bubbles rise, the surface is flat and consistent, and thin-layer cement paste is presented.
6. A process for constructing precast panels for bridge deck according to claim 1 wherein spot welding is used instead of banding in the installation of the reinforcing bars.
7. The construction process of the bridge deck precast slab according to claim 1, wherein the acceptance of the template is to check whether the inner size, flatness and the like of the template meet design requirements, if the template is deformed excessively or damaged, the template mold needs to be adjusted or modified again, and the template can be put into use after the acceptance is passed.
8. The construction process of the bridge deck precast slab according to claim 1, wherein mechanical intelligent equipment is adopted for batching the steel bars, and the mechanical equipment is provided with a bending machine for bending the steel bars; cutting off the steel bar by the cutting machine; straightening the bent steel bars by a straightening machine; the surface of the steel bar should be kept clean, and before concrete pouring, surface oil stains, paint skin, scale rust and the like should be removed.
9. The process of claim 1, wherein the geotextile covering is performed after the concrete is poured and initially set, and the geotextile is covered and then water-soaked geotextile is applied to keep moisture of the concrete.
10. The construction process of the bridge deck precast slab according to claim 1, wherein when the average air temperature is higher than 5 ℃, the watering maintenance of the covering geotextile is carried out within 12 hours after the concrete pouring is finished; the curing time of the concrete mixed by Portland cement, ordinary Portland cement or slag Portland cement is not less than 7 days; the curing time of the concrete with the addition of the retarding admixture, the mineral admixture or the impermeability requirement is not less than 14 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210514085.XA CN114800848A (en) | 2022-05-11 | 2022-05-11 | Bridge deck precast slab construction process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210514085.XA CN114800848A (en) | 2022-05-11 | 2022-05-11 | Bridge deck precast slab construction process |
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| Publication Number | Publication Date |
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| CN114800848A true CN114800848A (en) | 2022-07-29 |
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| CN202210514085.XA Pending CN114800848A (en) | 2022-05-11 | 2022-05-11 | Bridge deck precast slab construction process |
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2022
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