CN114000379A - Concrete construction method for CRTS I double-block ballastless track bed plate - Google Patents
Concrete construction method for CRTS I double-block ballastless track bed plate Download PDFInfo
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- CN114000379A CN114000379A CN202111355218.5A CN202111355218A CN114000379A CN 114000379 A CN114000379 A CN 114000379A CN 202111355218 A CN202111355218 A CN 202111355218A CN 114000379 A CN114000379 A CN 114000379A
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- 238000010276 construction Methods 0.000 title claims abstract description 68
- 238000002156 mixing Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 238000009415 formwork Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000003490 calendering Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 241001669679 Eleotris Species 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000012615 aggregate Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000004746 geotextile Substances 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 3
- 238000006703 hydration reaction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000007726 management method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/005—Making of concrete parts of the track in situ
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention relates to the technical field of concrete construction, in particular to a CRTS I double-block ballastless track bed slab concrete construction method. The method comprises the following steps: s1, raw material storage management; s2, detecting the moisture content of the aggregate; s3, inputting concrete mixing ratio process parameters S4, binding the roadbed slab steel bars and installing the formworks; s5, stirring concrete; s6, detecting the performance of the concrete, and judging whether the performance is qualified or not S7, and judging whether the supporting layer and the track block are wet and concrete pouring; s8, smearing and calendering for multiple times; s9, spraying the curing liquid, and loosening the fishplate and the fastener; and S10, removing the mould, spraying curing agent on the two sides of the concrete of the track bed plate, and covering and curing. The construction method has detailed steps, effectively ensures the quality of concrete construction, and simultaneously improves the construction efficiency. The method is mainly applied to the concrete construction aspect of the ballastless track bed plate.
Description
Technical Field
The invention relates to the technical field of concrete construction, in particular to a CRTS I double-block ballastless track bed slab concrete construction method.
Background
The ballast bed slab concrete is an important component of a CRTS I type double-block ballastless track structure, and the performance of the ballast bed slab concrete has great influence on the smoothness and durability of the track structure. The performance of the track bed plate concrete is obviously influenced by the quality of raw materials, mixing ratio parameters, construction environment temperature and construction process control under multiple constraint conditions, and the quality of the track bed plate concrete is difficult to guarantee due to large construction environment difference especially under severe natural climate conditions such as strong wind, drought, large temperature difference, large wind sand, strong sunshine and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a CRTS I double-block ballastless track bed plate concrete construction method, which overcomes the concrete quality problem caused by environmental influence when the track bed plate concrete is constructed in the prior art, has perfect construction steps and effectively ensures the finished product quality of the CRTS I double-block ballastless track bed plate concrete and the stability of a track bed plate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the concrete construction method of the CRTS I double-block ballastless track bed plate comprises the following steps:
s1, raw material storage management;
s2, detecting the moisture content of the aggregate;
s3, inputting concrete mixing ratio process parameters: the mixing proportion is designed according to the structural characteristics of the ballast bed slab, construction conditions and performance required by environmental conditions, and a test mixing proportion is provided on the basis of comprehensive working performance, mechanical performance, shrinkage performance, durability and crack resistance;
s4, binding of a bed plate steel bar and installing of a template;
s5, stirring concrete;
s6, detecting the performance of the concrete, judging whether the concrete is qualified or not, if the concrete is not qualified, adjusting the mixing ratio process in time, and filling an adjustment record;
s7, wetting the supporting layer and the track block and pouring concrete;
s8, smearing and calendering for multiple times;
s9, spraying the curing liquid, and loosening the fishplate and the fastener;
and S10, removing the formwork, and immediately spraying curing agent on the two sides of the concrete of the ballast bed slab and covering and curing the concrete after the formwork is removed.
In the step S2, in order to ensure the stability of the water content of the fine aggregate, the washed fine aggregate cannot be used immediately after entering the field and being qualified through inspection, the fine aggregate can be used after the water content is stable, in order to ensure the stability of the quality of the material source, the coarse aggregate and the fine aggregate of different manufacturers are strictly forbidden to be mixed in the same storage bin, the coarse aggregate within 20cm above the ground of the storage bin is strictly forbidden to be used, the residual materials are screened and washed regularly, the fine aggregate can be used after being qualified, and the additive bin must be shaded in summer and be strictly forbidden to be exposed to the sun; the heat preservation is carried out in winter, the crystallization is prevented, and the admixtures of different batches cannot be mixed for use.
In the step S3, when the mix proportion of the ballast bed slab concrete is designed, the use amount of each raw material component in the single-side concrete is calculated by using an absolute volume method, and whether the total alkali content, the chloride ion content and the sulfur trioxide content of the single-side concrete meet the requirements of the detailed rules is calculated, otherwise, the raw materials should be selected again or the mix proportion should be adjusted until the requirements are met; in order to improve the durability of the concrete and improve the workability, the shrinkage performance and the crack resistance of the concrete, a proper amount of high-quality fly ash is added into the concrete, and the adding amount of the fly ash is determined by tests; the ground slag powder cannot be independently doped, the concrete mixing proportion at least considers the climate factors of summer construction and winter construction, the mixing amount of the fly ash is increased in the summer mixing proportion to reduce the hydration heat of the concrete, and the mixing amount of the ground slag powder is increased in the winter construction to ensure the early strength.
In step S4, the specific steps include supporting layer detection and cleaning; paving the lower layer steel bars of the ballast bed plate; positioning the track panel in place and roughly adjusting; paving upper-layer steel bars of the ballast bed plate; mounting a telescopic seam plate and a template; finely adjusting and fixing the track panel; and (5) checking the insulating property.
In the step S5, before the concrete is stirred, the moisture content of the coarse and fine aggregates should be strictly measured, the moisture content change of the coarse and fine aggregates caused by weather change is accurately measured, so that the construction mix proportion is adjusted in time, the moisture content of the aggregates is measured at least once every 4 hours in rainy days, and the concrete construction mix proportion is adjusted in time according to the measurement result; when stirring, firstly adding fine aggregate, coarse aggregate, cement, mineral admixture and the like into the stirrer, stirring uniformly, then adding the mixing water and the admixture, and continuously stirring until the mixture is uniform, wherein the stirring time of each stage is not less than 30s, and the stirring time is not less than 2 min.
In the step S6, at least two testers are equipped in the laboratory during stirring, one worker monitors the mixing process of the track bed slab concrete in the mixing station, the other worker tracks the concrete state in the construction site, the slump of the entering mold during concrete pumping construction in the casting site should not be greater than 140mm, the slump during bucket delivery construction should not be greater than 120mm, and segregation and bleeding should not occur, and if the slump is abnormal, the mixing station is informed to adjust the construction mixing ratio in time.
In the step S7, before pouring the track bed slab concrete, the sealing condition of the formworks around the track bed slab should be checked, and the sealing condition of the transverse side seams between the track bed slabs should be checked to ensure that the formworks and the side seams are sealed without slurry leakage; before casting, the supporting layer and the sleeper are wetted by high-pressure atomized water to ensure that the supporting layer and the sleeper are completely wetted but no obvious water accumulation is required.
In the step S7, the number of the cast-in-place plug-in high-frequency vibrating rods is not less than 4, the vibrating rods are prevented from touching the track panel and the support frame during vibrating, the plug-in points are uniformly arranged and do not leak vibration, meanwhile, a specially-assigned person is arranged to pay attention to the change of the geometric state of the track panel and the falling of the insulation card, the stability and firmness of the track panel, the template and the support frame and the insulation effect of the steel bar are ensured, if the position of the track panel, the casting and the vibrating are stopped immediately, and the adjustment work is completed before the initial setting of the concrete; in the vibrating process, the vibration of the bottom of the sleeper and the concrete around the sleeper is enhanced to ensure the compactness of the concrete, and in order to reduce cracks at the splayed corners and peripheral cracks of sleeper blocks, a secondary vibrating process is adopted, wherein a phi 50 vibrating rod is adopted for vibrating between the sleepers for the first time, and a phi 30 vibrating rod is adopted for vibrating around the sleeper for the second time.
In the step S8, the concrete is trowelled by wood within half an hour after being put into a mold, trowelled by steel within 1-2 hours, secondary trowelling and press polishing are carried out when the concrete is close to initial setting in order to prevent fine cracks from being generated due to water loss of the surface of the concrete, the press polishing frequency is not less than 3 times, and water sprinkling is strictly forbidden when the trowelling and press polishing are carried out.
In the step S9, water is not sprayed before the curing agent is formed into a film, and the geotextile, the plastic film and the quilt are covered in time for wind prevention and heat preservation; before concrete sets finally, unscrew all fasteners, loosen fishplate splint bolt, prevent that frame temperature stress from drawing and splitting the concrete, carry simultaneously and loosen all expansion joint horizontal templates and construction joint template.
Compared with the prior art, the invention has the beneficial effects that:
the method has the advantages that the requirements on the selection of construction raw materials and the storage conditions and the mixing proportion process improve the durability of the concrete, and improve the construction performance, the shrinkage performance and the crack resistance of the concrete; the roadbed slab steel bars are bound and the templates are installed and connected firmly, the roadbed slab steel bars have enough strength, the steel bars and the templates are simple to manufacture and erect, and the roadbed slab steel bars and the templates are convenient to disassemble and use for many times; the stirring construction and performance detection of the concrete ensure the quality of the concrete and avoid the phenomenon of the quality reduction of the plastering of the concrete; the vibration process ensures a dense chamber of concrete; repeated floating ensures the flatness of the concrete, and avoids quality problems such as slab staggering and the like; the timely maintenance operation avoids the cracking of the concrete. The construction method has detailed steps, effectively ensures the quality of concrete construction, and simultaneously improves the construction efficiency.
Drawings
FIG. 1 is a schematic view of the construction process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are 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.
As shown in fig. 1, the method for constructing the concrete of the CRTS I double-block ballastless track bed slab comprises the following steps:
s1, raw material storage management;
s2, detecting the moisture content of the aggregate;
s3, inputting concrete mixing ratio process parameters: the mixing proportion is designed according to the structural characteristics of the ballast bed slab, construction conditions and performance required by environmental conditions, and a test mixing proportion is provided on the basis of comprehensive working performance, mechanical performance, shrinkage performance, durability and crack resistance;
s4, binding of a bed plate steel bar and installing of a template;
s5, stirring concrete;
s6, detecting the performance of the concrete, judging whether the concrete is qualified or not, if the concrete is not qualified, adjusting the mixing ratio process in time, and filling an adjustment record;
s7, wetting the supporting layer and the track block and pouring concrete;
s8, smearing and calendering for multiple times;
s9, spraying the curing liquid, and loosening the fishplate and the fastener;
and S10, removing the formwork, and immediately spraying curing agent on the two sides of the concrete of the ballast bed slab and covering and curing the concrete after the formwork is removed.
Preferably, in step S2, in order to ensure the stability of the moisture content of the fine aggregate, the fine aggregate is not used immediately after the fine aggregate is washed and qualified by field inspection, the fine aggregate can be used after the moisture content is stabilized, in order to ensure the stability of the quality of the material source, the coarse aggregate and the fine aggregate of different manufacturers are strictly forbidden to be mixed in the same storage bin, the coarse aggregate within 20cm above the ground of the storage bin is strictly forbidden to be used, the residual material is screened and washed regularly, the fine aggregate can be used after the fine aggregate is qualified, and the additive bin must be shaded in summer and be strictly forbidden to be exposed to the sun; the heat preservation is carried out in winter, the crystallization is prevented, and the admixtures of different batches cannot be mixed for use. The additive bin must be shaded in summer and is not exposed to the sun strictly; and keeping the temperature in winter to prevent crystallization. In order to ensure the uniformity of the quality of the admixture, the admixtures of different batches cannot be mixed for use.
Preferably, in step S3, when the ballast bed slab concrete mix proportion is designed, the use amount of each raw material component in the single-side concrete is calculated by using an absolute volume method, and whether the total alkali content, the chloride ion content and the sulfur trioxide content of the single-side concrete meet the requirements of the detailed rules is calculated, otherwise, the raw materials should be selected again or the mix proportion should be adjusted until the requirements are met; in order to improve the durability of the concrete and improve the workability, the shrinkage performance and the crack resistance of the concrete, a proper amount of high-quality fly ash is added into the concrete, and the adding amount of the fly ash is determined by tests; the ground slag powder cannot be independently doped, the concrete mixing proportion at least considers the climate factors of summer construction and winter construction, the mixing amount of the fly ash is increased in the summer mixing proportion to reduce the hydration heat of the concrete, and the mixing amount of the ground slag powder is increased in the winter construction to ensure the early strength.
The water reducing agent, the air entraining agent, the internal curing material and the like are required to be within a proper mixing amount range, the required performance of the concrete mixture can be obtained, no negative effect is caused on the performance of the hardened concrete, the specific mixing amount is determined through experiments, and when the concrete raw material, the construction environment temperature and the like are greatly changed, the mixing ratio of the concrete is required to be adjusted in time.
Preferably, in step S4, the specific steps include supporting layer detection and cleaning; paving the lower layer steel bars of the ballast bed plate; positioning the track panel in place and roughly adjusting; paving upper-layer steel bars of the ballast bed plate; mounting a telescopic seam plate and a template; finely adjusting and fixing the track panel; and (5) checking the insulating property.
And after the insulation performance of the steel bars is detected to be qualified, removing sundries in the steel bar net, installing the lateral template and the expansion joint partition plate, reinforcing the template, and ensuring that no connection exists between the lateral template and the track.
When slurry leakage possibly needs to be blocked by adopting mortar at the contact position of the track bed plate concrete template and the supporting layer (bed plate), a thin iron sheet or angle steel is adopted as a lining at the inner side of the template, the blocking mortar is tightly added and the smooth contact surface with the track bed plate concrete is ensured, after the lining material is removed, the contact surface of the mortar and the track bed plate concrete is closed by using a waterproof material, and the blocking mortar is removed in time after the template is removed, so that the phenomenon of root rot of the track bed plate concrete is avoided.
Preferably, in step S5, before the concrete is stirred, the moisture content of the coarse and fine aggregates should be strictly measured, and the moisture content change of the coarse and fine aggregates caused by weather change should be accurately measured, so as to adjust the construction mix proportion in time, measure the moisture content of the aggregates 2 times per shift, measure the aggregates at any time in rainy days, measure the aggregates at least once every 4h, and adjust the concrete construction mix proportion in time according to the measurement result; when stirring, firstly adding fine aggregate, coarse aggregate, cement, mineral admixture and the like into the stirrer, stirring uniformly, then adding the mixing water and the admixture, and continuously stirring until the mixture is uniform, wherein the stirring time of each stage is not less than 30s, and the stirring time is not less than 2 min.
In winter construction, the highest temperature of water and aggregate to be preheated is determined through thermal calculation and trial mixing so as to ensure the mold-entering temperature of concrete. The temperature of the mixture should preferably be adjusted by preheating the mixture water, but the heating temperature of the water should not be higher than 80 ℃. When the heating water can not meet the requirement or the aggregate contains impurities such as ice, snow and the like, the aggregate can be heated at the heating temperature of not higher than 60 ℃. The cement, the additive and the mineral admixture can be conveyed into a greenhouse for natural preheating before use, but can not be directly heated.
Preferably, in step S6, the laboratory is equipped with at least two testers during stirring, one worker monitors the mixing process of the track bed slab concrete at the mixing station, the other worker tracks the concrete state at the construction site, the slump of the entering mold during concrete pumping construction at the casting site should not be greater than 140mm, the slump of the entering mold during bucket delivery construction should not be greater than 120mm, and segregation and bleeding should not be avoided, and if abnormal condition does not occur, the mixing station is timely notified to adjust the construction mixing ratio.
Preferably, in step S7, before pouring the slab concrete, the sealing condition of the formworks around the slab should be checked, and the sealing condition of the transverse side seams between the slabs should be checked to ensure that the formworks and the side seams are sealed without slurry leakage; before casting, the supporting layer and the sleeper are wetted by high-pressure atomized water to ensure that the supporting layer and the sleeper are completely wetted but no obvious water accumulation is required.
Preferably, in step S7, the number of the cast-in-place insertion-type high-frequency vibrating rods is not less than 4, the vibrating rods are prevented from touching the track panel and the support frame during vibrating, the insertion points are uniformly arranged and do not leak vibration, and a specially-assigned person is arranged to pay attention to the change of the geometric state of the track panel and the falling of the insulation card, so as to ensure the stability and firmness of the track panel, the template and the support frame and the insulation effect of the steel bar, if the position of the track panel, the casting and vibrating are stopped immediately, and the adjustment is completed before the initial setting of the concrete; in the vibrating process, the vibration of the bottom of the sleeper and the concrete around the sleeper is enhanced to ensure the compactness of the concrete, and in order to reduce cracks at the splayed corners and peripheral cracks of sleeper blocks, a secondary vibrating process is adopted, wherein a phi 50 vibrating rod is adopted for vibrating between the sleepers for the first time, and a phi 30 vibrating rod is adopted for vibrating around the sleeper for the second time.
Preferably, in step S8, the concrete is trowelled by wood within half an hour after being placed into a mold, trowelled by steel within 1-2 hours, and secondary trowelling and press polishing are performed when the concrete is close to initial setting, the press polishing frequency is not less than 3 times, and water sprinkling is strictly prohibited when trowelling and press polishing are performed, so as to prevent fine cracks from being generated due to water loss on the surface of the concrete.
Preferably, in step S9, the geotextile, the plastic film and the quilt are covered in time for wind prevention and heat preservation without sprinkling water before the curing agent is formed into a film; before concrete sets finally, unscrew all fasteners, loosen fishplate splint bolt, prevent that frame temperature stress from drawing and splitting the concrete, carry simultaneously and loosen all expansion joint horizontal templates and construction joint template.
The form removal is preferably performed in reverse direction according to the form standing sequence, so that the concrete around the track bed plate cannot be damaged, and the damage of the form is reduced. When the template is separated from the concrete of the ballast bed plate, the template can be disassembled and hoisted. After the template is removed, the overall dimension of the concrete road bed board can be checked in time.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
- The CRTS I double-block ballastless track slab concrete construction method is characterized by comprising the following steps:s1, raw material storage management;s2, detecting the moisture content of the aggregate;s3, inputting concrete mixing ratio process parameters: the mixing proportion is designed according to the structural characteristics of the ballast bed slab, construction conditions and performance required by environmental conditions, and a test mixing proportion is provided on the basis of comprehensive working performance, mechanical performance, shrinkage performance, durability and crack resistance;s4, binding of a bed plate steel bar and installing of a template;s5, stirring concrete;s6, detecting the performance of the concrete, judging whether the concrete is qualified or not, if the concrete is not qualified, adjusting the mixing ratio process in time, and filling an adjustment record;s7, wetting the supporting layer and the track block and pouring concrete;s8, smearing and calendering for multiple times;s9, spraying the curing liquid, and loosening the fishplate and the fastener;and S10, removing the formwork, and immediately spraying curing agent on the two sides of the concrete of the ballast bed slab and covering and curing the concrete after the formwork is removed.
- 2. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S2, in order to ensure the stability of the water content of the fine aggregate, the washed fine aggregate cannot be used immediately after entering the field and being qualified through inspection, the fine aggregate can be used after the water content is stable, in order to ensure the stability of the quality of the material source, the coarse aggregate and the fine aggregate of different manufacturers are strictly forbidden to be mixed in the same storage bin, the coarse aggregate within 20cm above the ground of the storage bin is strictly forbidden to be used, the residual materials are screened and washed regularly, the fine aggregate can be used after being qualified, and the additive bin must be shaded in summer and be strictly forbidden to be exposed to the sun; the heat preservation is carried out in winter, the crystallization is prevented, and the admixtures of different batches cannot be mixed for use.
- 3. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S3, when the mix proportion of the ballast bed slab concrete is designed, the use amount of each raw material component in the single-side concrete is calculated by using an absolute volume method, and whether the total alkali content, the chloride ion content and the sulfur trioxide content of the single-side concrete meet the requirements of the detailed rules is calculated, otherwise, the raw materials should be selected again or the mix proportion should be adjusted until the requirements are met; in order to improve the durability of the concrete and improve the workability, the shrinkage performance and the crack resistance of the concrete, a proper amount of high-quality fly ash is added into the concrete, and the adding amount of the fly ash is determined by tests; the ground slag powder cannot be independently doped, the concrete mixing proportion at least considers the climate factors of summer construction and winter construction, the mixing amount of the fly ash is increased in the summer mixing proportion to reduce the hydration heat of the concrete, and the mixing amount of the ground slag powder is increased in the winter construction to ensure the early strength.
- 4. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in step S4, the specific steps include supporting layer detection and cleaning; paving the lower layer steel bars of the ballast bed plate; positioning the track panel in place and roughly adjusting; paving upper-layer steel bars of the ballast bed plate; mounting a telescopic seam plate and a template; finely adjusting and fixing the track panel; and (5) checking the insulating property.
- 5. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S5, before the concrete is stirred, the moisture content of the coarse and fine aggregates should be strictly measured, the moisture content change of the coarse and fine aggregates caused by weather change is accurately measured, so that the construction mix proportion is adjusted in time, the moisture content of the aggregates is measured at least once every 4 hours in rainy days, and the concrete construction mix proportion is adjusted in time according to the measurement result; when stirring, firstly adding fine aggregate, coarse aggregate, cement, mineral admixture and the like into the stirrer, stirring uniformly, then adding the mixing water and the admixture, and continuously stirring until the mixture is uniform, wherein the stirring time of each stage is not less than 30s, and the stirring time is not less than 2 min.
- 6. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S6, at least two testers are equipped in the laboratory during stirring, one worker monitors the mixing process of the track bed slab concrete in the mixing station, the other worker tracks the concrete state in the construction site, the slump of the entering mold during concrete pumping construction in the casting site should not be greater than 140mm, the slump during bucket delivery construction should not be greater than 120mm, and segregation and bleeding should not occur, and if the slump is abnormal, the mixing station is informed to adjust the construction mixing ratio in time.
- 7. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S7, before pouring the track bed slab concrete, the sealing condition of the formworks around the track bed slab should be checked, and the sealing condition of the transverse side seams between the track bed slabs should be checked to ensure that the formworks and the side seams are sealed without slurry leakage; before casting, the supporting layer and the sleeper are wetted by high-pressure atomized water to ensure that the supporting layer and the sleeper are completely wetted but no obvious water accumulation is required.
- 8. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S7, the number of the cast-in-place plug-in high-frequency vibrating rods is not less than 4, the vibrating rods are prevented from touching the track panel and the support frame during vibrating, the plug-in points are uniformly arranged and do not leak vibration, meanwhile, a specially-assigned person is arranged to pay attention to the change of the geometric state of the track panel and the falling of the insulation card, the stability and firmness of the track panel, the template and the support frame and the insulation effect of the steel bar are ensured, if the position of the track panel, the casting and the vibrating are stopped immediately, and the adjustment work is completed before the initial setting of the concrete; in the vibrating process, the vibration of the bottom of the sleeper and the concrete around the sleeper is enhanced to ensure the compactness of the concrete, and in order to reduce cracks at the splayed corners and peripheral cracks of sleeper blocks, a secondary vibrating process is adopted, wherein a phi 50 vibrating rod is adopted for vibrating between the sleepers for the first time, and a phi 30 vibrating rod is adopted for vibrating around the sleeper for the second time.
- 9. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S8, the concrete is trowelled by wood within half an hour after being put into a mold, trowelled by steel within 1-2 hours, secondary trowelling and press polishing are carried out when the concrete is close to initial setting in order to prevent fine cracks from being generated due to water loss of the surface of the concrete, the press polishing frequency is not less than 3 times, and water sprinkling is strictly forbidden when the trowelling and press polishing are carried out.
- 10. The CRTS I double-block ballastless track bed plate concrete construction method according to claim 1, characterized in that: in the step S9, water is not sprayed before the curing agent is formed into a film, and the geotextile, the plastic film and the quilt are covered in time for wind prevention and heat preservation; before concrete sets finally, unscrew all fasteners, loosen fishplate splint bolt, prevent that frame temperature stress from drawing and splitting the concrete, carry simultaneously and loosen all expansion joint horizontal templates and construction joint template.
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| CN114575203A (en) * | 2022-03-18 | 2022-06-03 | 中铁十二局集团有限公司 | Construction method for preventing and treating cracks of ballastless track bed of plateau railway tunnel |
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