CN114575203A - Construction method for preventing and treating cracks of ballastless track bed of plateau railway tunnel - Google Patents
Construction method for preventing and treating cracks of ballastless track bed of plateau railway tunnel Download PDFInfo
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- CN114575203A CN114575203A CN202210268538.5A CN202210268538A CN114575203A CN 114575203 A CN114575203 A CN 114575203A CN 202210268538 A CN202210268538 A CN 202210268538A CN 114575203 A CN114575203 A CN 114575203A
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- 238000010276 construction Methods 0.000 title claims abstract description 60
- 239000004567 concrete Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000012423 maintenance Methods 0.000 claims abstract description 17
- 238000005336 cracking Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 230000002787 reinforcement Effects 0.000 claims abstract description 6
- 230000008439 repair process Effects 0.000 claims abstract description 5
- 239000011414 polymer cement Substances 0.000 claims abstract description 4
- 238000005067 remediation Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000005457 optimization Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 241001669679 Eleotris Species 0.000 claims description 6
- 229910000746 Structural steel Inorganic materials 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 241000196324 Embryophyta Species 0.000 claims description 3
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000004574 high-performance concrete Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 241000270708 Testudinidae Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
- E01B31/20—Working or treating non-metal sleepers in or on the line, e.g. marking, creosoting
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention relates to the technical field of railway ballast bed construction, in particular to a construction method for preventing and treating cracks of a ballastless ballast bed of a plateau railway tunnel. The method comprises the following steps: s1, optimizing reinforcement; s2, optimizing the mixing ratio; s3, constructing a template and a steel bar; s4, mixing and transporting concrete, pouring and vibrating for construction; s5, maintenance construction; s6, ballast bed slab crack remediation: when the width of the crack is less than 0.2mm, the crack is treated by adopting a surface sealing method, and the polymer cement waterproof coating seals and repairs the surface of the crack; when the width of the crack is more than or equal to 0.2mm and less than 0.5mm, adopting a non-pressure grouting method and a surface sealing treatment method to repair the crack; when the width of the crack is more than or equal to 0.5mm, repairing the crack of the ballast bed plate by adopting a low-pressure grouting method and a surface sealing method; and S7, verifying the drill core. The method controls the construction raw materials, can effectively reduce the generation of cracks, has a good construction effect by a targeted crack treatment method, avoids secondary cracking, and improves the construction efficiency. The method is mainly applied to the construction aspect of crack prevention and control of the ballastless track bed.
Description
Technical Field
The invention relates to the technical field of railway ballast bed construction, in particular to a construction method for preventing and treating cracks of a ballastless ballast bed of a plateau railway tunnel.
Background
The railway tunnel is built in a plateau area, the air humidity is low, the temperature difference change is large, after the tunnel is communicated, the internal temperature and humidity change violently, splayed cracks, tortoise cracks, transverse cracks, vertical cracks and other surface cracks at four corners of a supporting block easily occur on the constructed ballastless track bed due to low humidity, convection wind and temperature and humidity changes, and a small amount of communicated cracks exist on part of track bed boards. If the concrete cracks are not timely repaired, the smoothness, the durability and the loading capacity of the track are finally influenced, and even the driving safety is influenced. After the heavy-duty train runs repeatedly, cracks develop gradually to form the defect problem that the cracks cannot be repaired, the problems of water seepage of a track bed plate, cracking and damage of structural concrete and the like occur in local sections, and the operation safety and the immeasurable adjustment and treatment cost of the train are seriously influenced because the individual sections need to be reworked.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the plateau railway tunnel ballastless track bed crack prevention and treatment construction method, which starts with the working procedures of reinforcement optimization, raw material control, mix proportion optimization, construction maintenance and the like, optimizes prevention and treatment construction operation, effectively avoids the occurrence of ballastless track cracks, and simultaneously carries out targeted treatment on the cracks according to the crack conditions, thereby ensuring the construction quality of the track bed.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the construction method for preventing and treating the cracks of the ballastless track bed of the plateau railway tunnel comprises the following steps:
s1, reinforcement optimization: optimizing the reinforcing bar design of a ballastless track, and adding anti-cracking reinforcing bars at the position of the supporting block, which is easy to crack;
s2, optimizing the mixture ratio: the ballastless track concrete is designed according to the principle of 'three low and one high', namely low glue material consumption, low water consumption, low slump and high gas content;
s3, construction of the template and the steel bars: after the template and the steel bars are installed, checking and accepting the plane positions, elevations and firmness of the template and the steel bars, and strictly controlling the thickness of the protective layers of the structural steel bars and the anti-cracking steel bars;
s4, mixing and transporting concrete, pouring and vibrating for construction;
s5, maintenance construction: before the construction of a ballastless track, a windproof door curtain is hung at an entrance and an exit of a tunnel opening to ensure that the temperature and the humidity in the tunnel are basically constant, and after concrete pouring is finished and finished, geotextile is covered, and maintenance water pipes are arranged on the geotextile;
s6, ballast bed slab crack remediation: when the width of the crack is less than 0.2mm, processing by adopting a surface sealing method, and sealing and repairing the surface of the crack of the track bed slab by adopting a polymer cement waterproof coating; when the width of the crack is more than or equal to 0.2mm and less than 0.5mm, adopting a non-pressure grouting method and a surface sealing treatment method to repair the crack; when the width of the crack is more than or equal to 0.5mm, repairing the crack of the ballast bed plate by adopting a low-pressure grouting method and a surface sealing method;
s7, core drilling verification: after the cracks are treated according to different types, core drilling verification is carried out in time after the grouting material is solidified, the material proportion and the process parameters are dynamically adjusted, a mature and adaptive proportioning ratio and grouting pressure are formed, and the crack treatment effect is ensured.
In the step S1, hoop anti-crack reinforcing steel bars are additionally arranged around the sleeper of the ballastless track bed plate supporting block, and oblique anti-crack reinforcing steel bars and corresponding erection reinforcing steel bars are additionally arranged at four corners of the sleeper, so that the tensile strength of the concrete is increased.
In the step S2: the dosage of the concrete cementing material is preferably controlled to be 380kg3About not more than 400kg3(ii) a The water dosage is generally not more than 160kg3(ii) a The volume of the single-side maximum slurry of the concrete is generally not more than 0.323(ii) a The sand rate of the concrete is not more than 40%; the gas content of the concrete is controlled to be between 4 and 6 percent; all the concrete raw materials can be used for construction after being detected to be qualified.
In the step S3, a customized steel template is adopted, the template is polished and derusted completely before installation, a release agent is coated, longitudinal templates are sequentially placed according to template side lines popped by paying off, and adjacent templates are connected by bolts; the structural steel bars and the added anti-crack steel bars need to be processed in a processing plant in a centralized way, and the size and the specification meet the requirements of design specifications.
In the step S4, concrete is intensively mixed, the optimized and adjusted stable mixing ratio is adopted, each parameter is strictly controlled, before the concrete is out of the station and poured, the slump, the air content and the workability of the concrete are detected, and the unqualified concrete is strictly forbidden to be used as a ballastless track;
calculating the loss of the concrete transportation distance to slump, air content and workability, and adopting high-performance concrete with strong slump keeping performance when the transportation distance is too long;
the concrete is longitudinally vibrated from one side edge of the supporting block along the line until the concrete flows out from the bottom of the elastic supporting block; the vibration is strengthened under and around the elastic supporting block, so that no bubble or cavity phenomenon is generated under the elastic supporting block, and simultaneously, the tamping bar is prevented from contacting with the anti-crack ribs, the rubber sleeve boots and the track panel.
In the step S5, holes of the maintenance water pipe are opened at intervals of 15cm, workers are arranged in a day-night shift for segmented maintenance, and the maintenance time is not less than 14 days.
In step S6, the surface sealing method includes: observing and cleaning cracks and wetting the peripheries of the cracks; stirring the sealing material; painting a first layer of material; coating the second and third layers of materials; cleaning the site; covering and maintaining for three days; and (5) sanding the surface by using sand paper.
In the step S6, when the crack width is more than or equal to 0.2mm and less than 0.5mm, the construction steps are as follows: (1) removing impurities in the cracks by using a vacuum cleaner;
(2) an electric heating blower is adopted to remove moisture in the cracks, so that the cracks are guaranteed to be dry before grouting;
(3) grouting barriers are manufactured along two sides of the crack to prevent slurry leakage from polluting the surface of concrete, a grouting pipe is pre-embedded at the crack every 30-40 cm, and part of the grouting pipes are used as exhaust pipes;
(4) injecting a low-viscosity resin material into the crack by using a manual two-component grouting device, observing the resin permeation condition at any time in the injection process, and timely injecting a repairing material until the crack is full;
(5) and after the repairing material is cured, removing the crack enclosure, and polishing and flattening the redundant resin material on the surface of the crack.
In the step S6, when the crack width is more than or equal to 0.5mm, the construction steps are as follows: (1) cleaning the surface of the crack area by using a steel wire brush, and removing impurities around by using a vacuum cleaner;
(2) sealing the cracks by adopting a seam sealing material, and reserving a grouting hole and an exhaust hole in the sealing process;
(3) injecting a repairing material into the crack through a grouting device until the crack is fully filled;
(4) after the repairing material is solidified, removing the seam sealing material, and polishing the surface of the crack to be flat;
(5) and coating crack sealing material on the surface of the crack.
Compared with the prior art, the invention has the beneficial effects that:
anti-cracking reinforcing steel bars are added at the easy-cracking positions of the supporting blocks, so that the drawknot strength of the easy-cracking positions is improved, and the cracking conditions of the anti-cracking reinforcing steel bars can be reduced radically to a great extent; the optimized mixing proportion controls the quality of the track bed from the material consumption, thereby avoiding the cracking condition of the track bed; the transportation distance is used for calculating the loss of slump, air content and workability, so that the high performance of the concrete for construction is ensured, the concrete is longitudinally cast from one side edge of the supporting block along the line and vibrated, the vibrating effect is ensured, and the influence of air bubbles in the concrete on the quality of a finished product is reduced; aiming at different crack widths, the slag-free ballast bed cracks are pertinently rectified, the treatment pertinence is strong, the construction effect is good, and the construction problem of secondary cracks is not easy to occur. According to the invention, the construction raw materials are controlled through reinforcement optimization, raw material control and mixing proportion optimization, the construction quality is ensured, the generation of cracks can be effectively reduced, the targeted crack treatment method is used for effectively treating different cracks through a proper method, the construction effect is good, the risk of secondary cracking is avoided, and the construction efficiency is obviously improved.
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.
The construction method for preventing and treating the cracks of the ballastless track bed of the plateau railway tunnel comprises the following steps:
s1, reinforcement optimization: optimizing the reinforcing bar design of a ballastless track, and adding anti-cracking reinforcing bars at the position of the supporting block, which is easy to crack; the plane size and position of the anti-crack reinforcing steel bar and the control of the protective layer are strictly controlled in construction.
S2, optimizing the mixture ratio: the ballastless track concrete is designed according to the principle of 'three low and one high', namely low glue material consumption, low water consumption, low slump and high gas content;
s3, construction of the template and the steel bars: after the template and the steel bars are installed, checking and accepting the plane positions, elevations and firmness of the template and the steel bars, and strictly controlling the thickness of the protective layers of the structural steel bars and the anti-cracking steel bars;
s4, mixing and transporting concrete, pouring and vibrating for construction;
s5, maintenance construction: before the construction of a ballastless track, 1-2 windproof door curtains are hung at the entrance and exit of a tunnel opening to ensure that the temperature and the humidity in the tunnel are basically constant, and after concrete pouring is finished and face finishing is finished, geotextile is covered, and maintenance water pipes are arranged on the geotextile;
s6, ballast bed slab crack remediation: when the width of the crack is less than 0.2mm, processing by adopting a surface sealing method, and sealing and repairing the surface of the crack of the track bed slab by adopting a polymer cement waterproof coating; when the width of the crack is more than or equal to 0.2mm and less than 0.5mm, adopting a non-pressure grouting method and a surface sealing treatment method to repair the crack; when the width of the crack is more than or equal to 0.5mm, repairing the crack of the ballast bed board by adopting a low-pressure grouting method and a surface sealing method;
s7, core drilling verification: after the cracks are treated according to different types, core drilling verification is carried out in time after the grouting material is solidified, the material proportion and the process parameters are dynamically adjusted, a mature and adaptive proportioning ratio and grouting pressure are formed, and the crack treatment effect is ensured.
In the step S1, hoop anti-crack reinforcing steel bars are additionally arranged around the sleeper of the ballastless track bed plate supporting block, and oblique anti-crack reinforcing steel bars and corresponding erection reinforcing steel bars are additionally arranged at four corners of the sleeper, so that the tensile strength of the concrete is increased.
In the step S2: the dosage of the concrete cementing material is preferably controlled to be 380kg/m3About, not more than 400kg/m3(ii) a The water dosage is generally not more than 160kg/m3(ii) a The volume of the single-side maximum slurry of the concrete is generally not more than 0.32m3(ii) a The sand rate of the concrete is not more than 40%; the gas content of the concrete is controlled to be between 4 and 6 percent; all the concrete raw materials can be used for construction after being detected to be qualified. The field construction test section verifies the adaptability of the concrete mixing ratio, and individual parameters can be finely adjusted, so that the quality of the concrete is controlled, and the track bed plate is prevented from cracking due to the concrete.
In the step S3, a customized steel template is adopted, polishing and derusting are carried out cleanly before installation, a release agent is coated, longitudinal templates are sequentially placed according to template side lines popped out by paying off, and adjacent templates are connected by bolts; the structural steel bars and the added anti-crack steel bars need to be processed in a processing plant in a centralized way, and the size and the specification meet the requirements of design specifications.
In the step S4, the concrete is intensively mixed, the optimized and adjusted stable mixing proportion is adopted, each parameter is strictly controlled, before the concrete is out of the station and poured, the slump, the air content and the workability of the concrete are detected, and the unqualified concrete is strictly forbidden to be used as a ballastless track;
calculating the loss of the concrete transportation distance to slump, air content and workability, and adopting high-performance concrete with strong slump keeping performance when the transportation distance is too long; the concrete mixing capacity and the construction capacity are calculated before pouring, so that not only is the concrete pouring continuity ensured, but also the condition that a subsequent tank car cannot wait for overlong time to cause waste materials and influence the construction of the whole section of the track bed slab is ensured.
The mixing station, the pouring teams and the tank cars are uniformly provided with interphones, so that the smooth and orderly scheduling of the construction process information is ensured.
When concrete is poured, water is strictly forbidden to be added for stirring.
When the concrete is discharged, the discharge hole cannot be too high, the discharge is uniform, the excessive accumulation or the excessive concentration is strictly forbidden, and the rail panel is prevented from floating upwards.
The concrete is longitudinally vibrated from one side edge of the supporting block along the line until the concrete flows out from the bottom of the elastic supporting block; the vibration is strengthened under and around the elastic supporting block, so that no bubble or cavity phenomenon is generated under the elastic supporting block, and simultaneously, the tamping bar is prevented from contacting with the anti-crack ribs, the rubber sleeve boots and the track panel.
In the step S5, holes of the maintenance water pipe are opened at intervals of 15cm, workers are arranged in a day-night shift for segmented maintenance, and the maintenance time is not less than 14 days.
In step S6, the surface sealing method includes: observing and cleaning cracks and wetting the peripheries of the cracks; stirring the sealing material; coating a first layer of material; coating the second and third layers of materials; cleaning the site; covering and maintaining for three days; and (5) sanding the surface by using sand paper.
In the step S6, when the crack width is more than or equal to 0.2mm and less than 0.5mm, the construction steps are as follows: (1) removing impurities in the cracks by using a vacuum cleaner;
(2) an electric heating blower is adopted to remove moisture in the cracks, so that the cracks are guaranteed to be dry before grouting;
(3) grouting barriers are manufactured along two sides of the crack to prevent slurry leakage from polluting the surface of concrete, a grouting pipe is pre-embedded at the crack every 30-40 cm, and part of the grouting pipes are used as exhaust pipes;
(4) injecting a low-viscosity resin material into the crack by using a manual two-component grouting device, observing the resin permeation condition at any time in the injection process, and timely injecting a repairing material until the crack is full;
(5) and after the repairing material is cured, removing the crack enclosure, and polishing and flattening the redundant resin material on the surface of the crack.
In the step S6, when the crack width is more than or equal to 0.5mm, the construction steps are as follows: (1) cleaning the surface of the crack area by using a steel wire brush, and removing impurities around by using a vacuum cleaner;
(2) sealing the cracks by adopting a seam sealing material, and reserving a grouting hole and an exhaust hole in the sealing process;
(3) injecting a repairing material into the crack through a grouting device until the crack is full;
(4) after the repairing material is solidified, removing the seam sealing material, and polishing the surface of the crack to be flat;
(5) and coating crack sealing material on the surface of the crack.
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 (9)
1. The construction method for preventing and treating the cracks of the ballastless track bed of the plateau railway tunnel is characterized by comprising the following steps of:
s1, reinforcement optimization: optimizing the reinforcing bar design of a ballastless track, and adding anti-cracking reinforcing bars at the position of the supporting block, which is easy to crack;
s2, optimizing the mixing ratio: the ballastless track concrete is designed according to the principle of 'three low and one high', namely low glue material consumption, low water consumption, low slump and high gas content;
s3, construction of the template and the steel bars: after the template and the steel bars are installed, checking and accepting the plane positions, elevations and firmness of the template and the steel bars, and strictly controlling the thickness of the protective layers of the structural steel bars and the anti-cracking steel bars;
s4, mixing and transporting concrete, pouring and vibrating for construction;
s5, maintenance construction: before the construction of a ballastless track, a windproof door curtain is hung at an entrance and an exit of a tunnel opening to ensure that the temperature and the humidity in the tunnel are basically constant, and after concrete pouring is finished and finished, geotextile is covered, and maintenance water pipes are arranged on the geotextile;
s6, ballast bed slab crack remediation: when the width of the crack is less than 0.2mm, processing by adopting a surface sealing method, and sealing and repairing the surface of the crack of the track bed slab by adopting a polymer cement waterproof coating; when the width of the crack is more than or equal to 0.2mm and less than 0.5mm, adopting a non-pressure grouting method and a surface sealing treatment method to repair the crack; when the width of the crack is more than or equal to 0.5mm, repairing the crack of the ballast bed plate by adopting a low-pressure grouting method and a surface sealing method;
s7, core drilling verification: after the cracks are treated according to different types, core drilling verification is carried out in time after the grouting material is solidified, the material proportion and the process parameters are dynamically adjusted, a mature and adaptive proportioning ratio and grouting pressure are formed, and the crack treatment effect is ensured.
2. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S1, hoop anti-crack reinforcing steel bars are additionally arranged around the sleeper of the ballastless track bed plate supporting block, and oblique anti-crack reinforcing steel bars and corresponding erection reinforcing steel bars are additionally arranged at four corners of the sleeper, so that the tensile strength of the concrete is increased.
3. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S2: the dosage of the concrete cementing material is preferably controlled to be 380kg/m3About, not more than 400kg/m3(ii) a The water dosage is generally not more than 160kg/m3(ii) a The single-material maximum slurry volume of the concrete is generally not more than 0.32m3(ii) a The sand rate of the concrete is not more than 40%; the gas content of the concrete is controlled to be between 4 and 6 percent; all the concrete raw materials can be used for construction after being detected to be qualified.
4. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S3, a customized steel template is adopted, the template is polished and derusted completely before installation, a release agent is coated, longitudinal templates are sequentially placed according to template side lines popped by paying off, and adjacent templates are connected by bolts; the structural steel bars and the added anti-crack steel bars need to be processed in a processing plant in a centralized way, and the size and the specification meet the requirements of design specifications.
5. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S4, concrete is intensively mixed, the optimized and adjusted stable mixing ratio is adopted, each parameter is strictly controlled, before the concrete is out of the station and poured, the slump, the air content and the workability of the concrete are detected, and the unqualified concrete is strictly forbidden to be used as a ballastless track;
calculating the loss of the concrete transportation distance to slump, air content and workability, and adopting high-performance concrete with strong slump keeping performance when the transportation distance is too far;
the concrete is longitudinally vibrated from one side edge of the supporting block along the line until the concrete flows out from the bottom of the elastic supporting block; the vibration is strengthened under and around the elastic supporting block, so that no bubble or cavity phenomenon is generated under the elastic supporting block, and simultaneously, the tamping bar is prevented from contacting with the anti-crack ribs, the rubber sleeve boots and the track panel.
6. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, which is characterized in that: in the step S5, holes of the maintenance water pipe are opened at intervals of 15cm, workers are arranged in a day-night shift for segmented maintenance, and the maintenance time is not less than 14 days.
7. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in step S6, the surface sealing method includes: observing and cleaning cracks and wetting the peripheries of the cracks; stirring the sealing material; painting a first layer of material; coating the second and third layers of materials; cleaning the site; covering and maintaining for three days; and (5) sanding the surface by using sand paper.
8. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S6, when the crack width is more than or equal to 0.2mm and less than 0.5mm, the construction steps are as follows: (1) removing impurities in the cracks by using a vacuum cleaner;
(2) an electric heating blower is adopted to remove moisture in the cracks, so that the cracks are guaranteed to be dry before grouting;
(3) grouting barriers are manufactured along two sides of the crack to prevent slurry leakage from polluting the surface of concrete, a grouting pipe is pre-embedded at the crack every 30-40 cm, and part of the grouting pipes are used as exhaust pipes;
(4) injecting a low-viscosity resin material into the crack by using a manual two-component grouting device, observing the resin permeation condition at any time in the injection process, and timely injecting a repairing material until the crack is full;
(5) and after the repairing material is cured, removing the crack enclosure, and polishing and flattening the redundant resin material on the surface of the crack.
9. The plateau railway tunnel ballastless track bed crack control construction method of claim 1, characterized in that: in the step S6, when the crack width is more than or equal to 0.5mm, the construction steps are as follows: (1) cleaning the surface of the crack area by using a steel wire brush, and removing impurities around by using a vacuum cleaner;
(2) sealing the cracks by adopting a seam sealing material, and reserving a grouting hole and an exhaust hole in the sealing process;
(3) injecting a repairing material into the crack through a grouting device until the crack is full;
(4) after the repairing material is solidified, removing the seam sealing material, and polishing the surface of the crack to be flat;
(5) and coating crack sealing material on the surface of the crack.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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