CN111962341A - Temperature control method for winter construction of bridge segment CRTS III plate type ballastless track - Google Patents
Temperature control method for winter construction of bridge segment CRTS III plate type ballastless track Download PDFInfo
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- CN111962341A CN111962341A CN202010817996.0A CN202010817996A CN111962341A CN 111962341 A CN111962341 A CN 111962341A CN 202010817996 A CN202010817996 A CN 202010817996A CN 111962341 A CN111962341 A CN 111962341A
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0263—Hardening promoted by a rise in temperature
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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Abstract
The invention discloses a temperature control method for winter construction of a bridge segment CRTS III slab ballastless track, which comprises the following steps: firstly, building a temperature control shed for winter construction of a bridge section CRTS III plate type ballastless track; secondly, raising the temperature of the temperature control shed in advance; thirdly, cooling the temperature control shed; fourthly, the temperature of the temperature control shed is raised for the second time; fifthly, heating the die cavity; sixthly, controlling the mold-entering temperature of the self-compacting concrete and pouring the track slab; and seventhly, maintaining the track slab with a mold. According to the invention, through a reasonable temperature control mode, a relatively stable pouring and curing temperature control condition is created for the low-temperature state construction of the self-compacting concrete of the CRTS III slab ballastless track, the track fine adjustment precision is satisfied, the problem that the low-temperature state construction and curing of the self-compacting concrete are difficult is solved, and the quality of the pouring and curing of the self-compacting concrete of the CRTS III slab ballastless track in the winter period is ensured.
Description
Technical Field
The invention belongs to the technical field of temperature control of ballastless track construction in winter, and particularly relates to a temperature control method for bridge segment CRTS III slab ballastless track construction in winter.
Background
Track board in III plate-type ballastless track of high-speed railway CRTS requires to use self-compaction concrete (self-compaction concrete is that concrete mixture has high mobility, high clearance trafficability characteristic and high separation resistance, need not when pouring to vibrate closely knit and just can evenly fill closely knit shaping by its dead weight effect, and have high durability and high volume stability's concrete) and pours, it is abundant to require to pour to fill, closely knit and with the ballastless track bed plate between aggregate evenly distributed, no soft weak layer of foaming, there is not segregation bleeding (promptly the concrete pour should be in even state after closely knit). The self-compacting concrete has fine and strict requirements on transportation, pouring and maintenance temperatures, and the traditional self-compacting concrete construction of the CRTS III slab ballastless track is carried out by selecting the time with the environment temperature of 10-20 ℃ and the relatively stable temperature value, so that the construction is difficult to implement in severe cold areas and the areas with the winter temperature below-10 ℃, and the construction is limited.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a temperature control method for construction of a CRTS III slab ballastless track at a bridge section in winter, through a reasonable temperature control mode, a relatively stable pouring and maintenance temperature control condition is created for construction of self-compacting concrete of the CRTS III slab ballastless track in a low-temperature state, the precision adjustment precision of the track is met, the problem of difficulty in construction and maintenance of the self-compacting concrete in the low-temperature state is solved, the quality of pouring and maintenance of the self-compacting concrete of the CRTS III slab ballastless track in winter is guaranteed, and the method is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: a temperature control method for winter construction of a bridge segment CRTS III slab ballastless track is characterized by comprising the following steps:
step one, building a temperature control shed for winter construction of a bridge section CRTS III plate type ballastless track: after the track slabs are paved coarsely, laying sleepers for mounting gantry crane tracks according to the widths and the design intervals of the two track slabs, and building a temperature control shed for the winter construction of a bridge segment CRTS III slab ballastless track;
the temperature control shed for the winter construction of the bridge section CRTS III slab ballastless track comprises a movable protection frame arranged on a bridge surface layer and a protection frame heat insulation layer wrapped outside the movable protection frame, wherein a plurality of fan heaters are sequentially arranged on the bridge surface section which is positioned between two base plates in the movable protection frame along the length direction of the CRTS III slab ballastless track, and two sides of the movable protection frame are respectively connected with sleepers which are arranged on the same side and are used for installing a gantry crane track through a plurality of cable wind ropes;
step two, raising the temperature of the temperature control shed in advance: after the temperature control shed is built, the movable protection frame is sealed by using the protection frame heat insulation layer, and the environment in the temperature control shed is heated in advance by using a plurality of fan heaters in the temperature control shed;
step three, cooling the temperature control shed: closing the plurality of warm air blowers when the track slab is finely adjusted, opening the heat insulation layers of the protection frame at the front end and the rear end of the movable protection frame in the length direction, and ventilating the front end and the rear end of the temperature control shed;
step four, secondary temperature rise of the temperature control shed: after the track slab is finely adjusted, closing the front end and the rear end of the heat-insulating layer of the protection frame in the length direction of the movable protection frame, sealing the temperature control shed again, opening a plurality of fan heaters, heating the temperature control shed again, and increasing the temperature of the track slab die cavity and the temperature of the track slab body until the temperature of the track slab die cavity is higher than 5 ℃;
step five, heating the die cavity: a plurality of heating furnace hot water pipes are respectively arranged on the top surface and the side surface of the track slab, and one ends of the plurality of heating furnace hot water pipes are respectively connected with the electric heating furnace;
preheating the exhaust port of the track slab before the track slab is poured, and plugging the pouring hole and the observation hole of the track slab when the exhaust port of the track slab is preheated;
step six, controlling the mold-entering temperature of the self-compacting concrete and pouring the track slab, wherein the process is as follows:
step 601, according to the formula
step 602, according to formula T1＝T0-0.16(T0-Tp) Calculating the machine-out temperature T of the self-compacting concrete1Wherein, TpIs the ambient temperature of the stirrer;
step 603, according to the formula T2＝T1-(bt+0.32n)(T1-Tm) Calculating the temperature T of the self-compacting concrete from transportation to pouring2Wherein b is the temperature loss coefficient, T is the time length from the transportation to the pouring of the self-compacting concrete, n is the transportation frequency of the self-compacting concrete, and TmIs the outside ambient temperature;
step 604, forming a shed roof pouring hole in a protective frame heat insulation layer on the top of the temperature control shed, and opening a track plate pouring hole, wherein the temperature in the temperature control shed is reduced by 4-7 ℃, and the temperature of a track plate die cavity is reduced by 0.5-1 ℃;
step 605, according to the formula
Calculating the mold-entering temperature T of the self-compacting concrete3Wherein, in the step (A),Ccspecific heat capacity of self-compacting concrete, McWeight per cubic meter of self-compacting concrete, CsIs the specific heat capacity of the die, MsThe weight of the mould at the junction with each cubic meter of concrete, TnIs the temperature of the mold;
step 606, pouring self-compacting concrete, and after pouring, blocking the shed roof pouring hole and the track slab pouring hole to finish the pouring of the track slab;
after the track slab filling pipe is pulled out, installing a plurality of concrete core temperature measuring elements, embedding the temperature measuring elements in the middle of the self-compacting concrete layer, and periodically recording temperature data;
step seven, maintaining the track slab with the mold: self-compaction concrete fills the completion, fills the pipe and extracts the back with anti-overflow pipe, continues to adopt electric fan heater and electric heating stove to keep warm to cover the track heat preservation on bed plate, track board, heating stove hot-water line and carry out the maintenance, the track heat preservation wraps up the track board completely, realizes track board area mould heat preservation maintenance of moisturizing.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: remove the protection frame and include a plurality of braced frames that set gradually along III plate-type ballastless track length direction of CRTS and connect a plurality of braced frames many longitudinal tie as an organic whole, braced frame includes the horizontal pole and installs many montants in the horizontal pole bottom, and the universal wheel is installed to the montant bottom.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: the protective frame heat-insulating layer comprises a plastic heat-insulating film, a cotton quilt heat-insulating layer and a waterproof flame-retardant protective layer which are sequentially paved from bottom to top.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: the bottom of the plastic heat-insulating film is pressed tightly through a weight block.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: the track heat-insulating layer comprises heat-insulating films covering a plurality of heating stove hot water pipes and heat-insulating quilts covering the heat-insulating films, and the heat-insulating films are plastic heat-insulating films.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: the quantity of montant among the braced frame is four, and two montants among four montants are located respectively between the base plate and the sleeper of corresponding side, and two other montants among four montants are located between two base plates, are provided with the bracing between montant and the horizontal pole.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: the length of the movable protection frame is not less than the single span length of the bridge.
The temperature control method for the winter construction of the bridge segment CRTS III plate type ballastless track is characterized by comprising the following steps of: in step 606, when self-compacting concrete is poured, a square hole of 80cm × 80cm is formed right above the track slab pouring hole so that workers can control the concrete flow in the charging bucket conveniently; and (5) plugging the square hole after the self-compacting concrete is poured.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the temperature control shed for the winter construction of the CRTS III slab ballastless track of the bridge section is built, the winter construction of the CRTS III slab ballastless track of the bridge section is realized in a one-span and one-span mode, and when the track slab is poured, the self-compacting concrete pouring construction is carried out by taking one temperature control shed as a construction unit, so that a relatively stable pouring and maintenance temperature control condition is created for the low-temperature state construction of the self-compacting concrete of the CRTS III slab ballastless track, and the popularization and the use are convenient.
2. According to the invention, after the temperature control shed is built, the environment in the temperature control shed is heated in advance by using a plurality of fan heaters in the temperature control shed so as to shorten the heating time of the temperature control shed after fine adjustment is finished, the temperature is generally heated in the daytime and is quickly raised, the plate cavity of the track plate is ensured to have higher temperature, the plurality of fan heaters are closed when the track plate is finely adjusted, the heat preservation layers of the protection frame are opened and are positioned at the front end and the rear end in the length direction of the movable protection frame to ventilate the front end and the rear end of the temperature control shed, the temperature is reduced when fine adjustment is carried out, because the CP III measuring point is outside the temperature control shed, the temperature outside the shed is generally below-10 ℃, the temperature in the shed can be ensured to be above-zero 5 ℃, the temperature difference between the inside and the outside of the shed is too large, the precision of the total station is.
3. The method has simple steps, ensures the required temperature when the track slab is poured by utilizing the secondary temperature rise of the temperature control shed and the temperature rise of the die cavity, smoothly realizes the pouring of the track slab by controlling the mold-entering temperature of the self-compacting concrete, and finally realizes the curing of the track slab with a die, thereby solving the problem that the self-compacting concrete is difficult to construct and cure in a low-temperature state, ensuring the quality of the pouring and curing of the self-compacting concrete of the CRTS III slab ballastless track in the winter period and being convenient for popularization and use.
In conclusion, the invention creates a relatively stable pouring and curing temperature control condition for the low-temperature state construction of the self-compacting concrete of the CRTS III slab ballastless track through a reasonable temperature control mode, simultaneously meets the track fine adjustment precision, solves the problem of difficult construction and curing of the low-temperature state of the self-compacting concrete, ensures the quality of the pouring and curing of the self-compacting concrete of the CRTS III slab ballastless track in the winter period, and is convenient for popularization and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of a temperature-controlled shed constructed in winter according to the present invention.
Fig. 2 is a right side view of fig. 1 with the insulation removed.
FIG. 3 is a block diagram of a method flow of the method of the present invention.
Description of reference numerals:
1-bridge surface course; 2-base plate; 3, a track slab;
4-hot water pipe of heating stove; 5, a track insulating layer; 6-vertical rod;
7, a cross bar; 8-longitudinal connecting rod; 9-universal wheel;
10-plastic heat preservation film; 11-heat insulation layer of cotton quilt; 12-waterproof flame-retardant protective layer;
13-a weight; 14-a guy rope; 15-gantry crane orbit;
16-a sleeper; 17, a warm air blower; 18-electric heating stove.
Detailed Description
As shown in fig. 1 to 3, the method for controlling the temperature of a bridge segment CRTS iii slab ballastless track in the winter construction according to the present invention includes the following steps:
step one, building a temperature control shed for winter construction of a bridge section CRTS III plate type ballastless track: after the track slabs 3 are paved coarsely, a sleeper 16 for mounting a gantry crane track 15 is paved according to the width and the design interval of the two track slabs 3, and a temperature control shed for constructing a bridge segment CRTS III slab ballastless track in the winter period is built;
the temperature control shed for the winter construction of the bridge section CRTS III slab ballastless track comprises a movable protection frame arranged on a bridge surface layer 1 and a protection frame heat insulation layer wrapped outside the movable protection frame, wherein a plurality of fan heaters 17 are sequentially arranged on the bridge surface section between two base plates 2 in the movable protection frame along the length direction of the CRTS III slab ballastless track, and two sides of the movable protection frame are respectively connected with sleepers 16 which are arranged on the same side and are used for mounting a gantry crane track 15 through a plurality of cable wind ropes 14;
in this embodiment, remove the protection frame and include a plurality of braced frames that set gradually along III plate-type ballastless track length direction of CRTS and connect a plurality of braced frames as an organic whole many longitudinal tie 8, braced frame includes horizontal pole 7 and installs many montants 6 in horizontal pole 7 bottom, and universal wheel 9 is installed to 6 bottoms of montant.
In this embodiment, the protection frame heat-insulating layer includes a plastic heat-insulating film 10, a cotton quilt heat-insulating layer 11 and a waterproof flame-retardant protective layer 12, which are laid in sequence from bottom to top.
In this embodiment, the bottom of the plastic heat-insulating film 10 is pressed by a weight 13.
It should be noted that the plastic heat-insulating film 10 has high strength and high density, and the bottom of the heat-insulating film is continuously provided with the weight 13 for pressing, so that the effects of sealing and wind proofing are achieved; because wind is blown more in winter, the heat-insulating film needs to be lapped up and down, the lapping length is not less than 0.5m, and the inner side and the outer side of the lapping end are pasted by plastic tapes, so that the open end of the heat-insulating film is not on the windward side; in order to prevent the heat-insulating film from being blown broken by wind, a layer of dense mesh net is adopted on the upper part of the heat-insulating film for covering and reinforcing, and the dense mesh net is bolted by utilizing the stable reinforcing steel bars and the wall body around, so that the stability of covering and reinforcing is ensured; in actual construction, a temperature control shed for construction of a bridge section CRTS III slab ballastless track in winter is built, construction of the bridge section CRTS III slab ballastless track in winter is realized in a one-span and one-span mode, when track slabs are poured, self-compacting concrete pouring construction is carried out by taking one temperature control shed as a construction unit, and a relatively stable pouring and maintenance temperature control condition is created for low-temperature construction of the self-compacting concrete of the CRTS III slab ballastless track.
In this embodiment, the quantity of montant 6 among the braced frame is four, and two montants 6 among four montants 6 are located respectively between the base plate 2 and the sleeper 16 of corresponding side, and two other montants 6 among four montants 6 are located between two base plates 2, are provided with the bracing between montant 6 and the horizontal pole 7.
In this embodiment, the length of the movable protection frame is not less than the single span length of the bridge.
Step two, raising the temperature of the temperature control shed in advance: after the temperature control shed is built, the protection frame is moved in a sealing mode through the protection frame heat insulation layer, and the temperature in the temperature control shed is increased in advance through a plurality of warm air blowers 17 in the temperature control shed;
step three, cooling the temperature control shed: when the track slab is finely adjusted, the plurality of warm air blowers 17 are closed, the heat insulation layers of the protection frame are opened and positioned at the front end and the rear end of the movable protection frame in the length direction, and the front end and the rear end of the temperature control shed are ventilated;
it should be noted that, a plurality of warm air blowers in the temperature control shed are used for warming the environment in the temperature control shed in advance, so that the warming time of the temperature control shed after fine adjustment is finished is shortened, generally, the temperature is raised quickly in daytime, the plate cavity of the track plate is guaranteed to have higher temperature, the plurality of warm air blowers are closed when the track plate is fine adjusted, the heat preservation layers of the protection frames are opened and positioned at the front end and the rear end of the length direction of the movable protection frame, the front end and the rear end of the temperature control shed are ventilated, the temperature is reduced when fine adjustment is performed, because the CP III measuring point is outside the temperature control shed, the temperature outside the shed is generally below-10 ℃, the temperature in the shed can be guaranteed to be above-zero 5 ℃, the temperature difference inside and outside the shed is too large, the precision of the total station is.
Step four, secondary temperature rise of the temperature control shed: after the track slab is finely adjusted, closing the front end and the rear end of the heat-insulating layer of the protection frame in the length direction of the movable protection frame, sealing the temperature control shed again, opening the plurality of fan heaters 17, heating the temperature control shed again, and increasing the temperature of the track slab die cavity and the temperature of the track slab body until the temperature of the track slab die cavity is higher than 5 ℃;
step five, heating the die cavity: a plurality of heating stove hot water pipes 4 are respectively arranged on the top surface and the side surface of the track slab 3, and one ends of the plurality of heating stove hot water pipes 4 are respectively connected with an electric heating stove 18;
preheating the exhaust port of the track slab before the track slab is poured, and plugging the pouring hole and the observation hole of the track slab when the exhaust port of the track slab is preheated;
it should be noted that, in time lay heating stove hot-water line 4 after the control by temperature change canopy is set up to accomplish, the heat preservation pipeline is laid at the track board top, and the left and right sides line respectively lays 2, guarantee that the heat preservation pipeline normal operating before the concrete pours, treat that the track board pours the preceding hour and use the hot-blast big gun to preheat the track board gas vent, the hot-blast big gun need keep away from the gas vent more than 50cm, prevent that track board local high temperature from causing the damage, but when the track board preheats shutoff track board pouring hole and observation hole, prevent that the heat from scattering and disappearing.
Step six, controlling the mold-entering temperature of the self-compacting concrete and pouring the track slab, wherein the process is as follows:
step 601, according to the formula
the unit of mass is kg, the unit of temperature is kg ℃, the unit of specific heat capacity is kJ/(kg. times. DEG C.), and the unit of heat of fusion is kJ/kg.
Step 602, according to formula T1＝T0-0.16(T0-Tp) Calculating the machine-out temperature T of the self-compacting concrete1Wherein, TpIs the ambient temperature of the stirrer;
step 603, according to the formula T2＝T1-(bt+0.32n)(T1-Tm) Calculating the temperature T of the self-compacting concrete from transportation to pouring2Wherein b is the temperature loss coefficient, T is the time length from the transportation to the pouring of the self-compacting concrete, n is the transportation frequency of the self-compacting concrete, and TmIs the outside ambient temperature;
step 604, forming a shed roof pouring hole in a protective frame heat insulation layer on the top of the temperature control shed, and opening a track plate pouring hole, wherein the temperature in the temperature control shed is reduced by 4-7 ℃, and the temperature of a track plate die cavity is reduced by 0.5-1 ℃;
step 605, according to the formula
Calculating the mold-entering temperature T of the self-compacting concrete3Wherein, CcSpecific heat capacity of self-compacting concrete, McWeight per cubic meter of self-compacting concrete, CsIs the specific heat capacity of the die, MsThe weight of the mould at the junction with each cubic meter of concrete, TnIs the temperature of the mold;
step 606, pouring self-compacting concrete, and after pouring, blocking the shed roof pouring hole and the track slab pouring hole to finish the pouring of the track slab;
after the track slab filling pipe is pulled out, installing a plurality of concrete core temperature measuring elements, embedding the temperature measuring elements in the middle of the self-compacting concrete layer, and periodically recording temperature data;
in this embodiment, in step 606, when the self-compacting concrete is poured, a square hole of 80cm × 80cm is formed right above the track slab pouring hole, so that a worker can control the concrete flow in the charging bucket; and (5) plugging the square hole after the self-compacting concrete is poured.
It is to be noted that the self-compacting concrete is poured into the mold at a temperature T3Temperature requirement of (1), controlling the temperature T of the sandsTemperature T of stonegTemperature T of cementcTemperature T of waterwAnd the pouring frequency n of the self-compacting concrete is checked and calculated again according to the transport distance duration and the concrete grade in the actual construction process, the water heating temperature and the aggregate heating temperature required in the actual operation are determined, and the mixture performance is ensured to meet the requirements.
In actual operation, the concrete transportation tank car is wrapped by the heat preservation quilt, the cover buckle made of the heat preservation quilt is adopted to seal the material inlet and the material outlet of the tank body in the transportation process, so that heat loss is reduced, the concrete transportation tank car can be quickly disassembled and quickly poured after arriving at the site, the dead time of the concrete transportation tank car at the site is reduced as much as possible, the temperature loss is reduced, and the mold-entering temperature of the concrete is not lower than 10 ℃.
Step seven, maintaining the track slab with the mold: self-compaction concrete fills the completion, fills the pipe and extracts the back with anti-overflow pipe, continues to adopt electric fan heater and electric heating stove to keep warm to cover track heat preservation 5 on bed plate 2, track board 3, heating stove hot-water line 4 and carry out the maintenance, track heat preservation 5 wraps up track board 3 completely, realizes track board area mould heat preservation maintenance of moisturizing.
In this embodiment, the track heat-insulating layer 5 comprises heat-insulating films covering the plurality of heating stove hot water pipes 4 and heat-insulating quilts covering the heat-insulating films, and the heat-insulating films are plastic heat-insulating films.
In actual operation, a plurality of bridge sections CRTS III plate type ballastless tracks in winter construction temperature control sheds can be built to simultaneously construct a multi-span bridge, a single bridge section CRTS III plate type ballastless track in winter construction temperature control shed can be used for construction of the bridge in a turnover mode, and a proper construction mode is selected according to actual on-site adjustment.
When the self-compacting concrete slab ballastless track is used, the temperature required during track slab pouring is ensured by utilizing the secondary temperature rise of the temperature control shed and the temperature rise of the mould cavity, the track slab pouring is smoothly realized by controlling the mould entering temperature of the self-compacting concrete, and finally the track slab is maintained with the mould, so that the problem that the self-compacting concrete is difficult to construct and maintain in a low-temperature state is solved, and the quality of the self-compacting concrete of the CRTS III slab ballastless track during the winter period is ensured; the temperature control mode of this embodiment not only has created a relatively stable control by temperature change condition of pouring and maintenance for the construction of the III plate-type ballastless track self-compaction concrete low temperature state of CRTS, satisfies the track fine tuning precision simultaneously, has solved the difficult problem of self-compaction concrete low temperature state construction and maintenance, has guaranteed the quality that III plate-type ballastless track self-compaction concrete of CRTS pours and maintains in winter.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (8)
1. A temperature control method for winter construction of a bridge segment CRTS III slab ballastless track is characterized by comprising the following steps:
step one, building a temperature control shed for winter construction of a bridge section CRTS III plate type ballastless track: after the track slabs (3) are paved coarsely, sleepers (16) for mounting gantry crane tracks (15) are paved according to the width and the design interval of the two track slabs (3), and a temperature control shed for constructing a bridge segment CRTS III slab ballastless track in the winter period is built;
the temperature control shed for the winter construction of the bridge section CRTS III slab ballastless track comprises a movable protection frame arranged on a bridge surface layer (1) and a protection frame heat insulation layer wrapped outside the movable protection frame, wherein a plurality of warm air blowers (17) are sequentially arranged on the bridge surface section between two base plates (2) in the movable protection frame along the length direction of the CRTS III slab ballastless track, and two sides of the movable protection frame are respectively connected with sleepers (16) which are arranged on the same side and are used for mounting gantry crane tracks (15) through a plurality of cable wind ropes (14);
step two, raising the temperature of the temperature control shed in advance: after the temperature control shed is built, the protection frame is moved in a sealing mode by using the protection frame heat insulation layer, and the temperature in the temperature control shed is raised in advance by using a plurality of warm air blowers (17) in the temperature control shed;
step three, cooling the temperature control shed: closing the plurality of warm air blowers (17) when the track slab is finely adjusted, opening the heat-insulating layers of the protection frame at the front end and the rear end of the movable protection frame in the length direction, and ventilating the front end and the rear end of the temperature control shed;
step four, secondary temperature rise of the temperature control shed: after the track slab is finely adjusted, closing the front end and the rear end of the heat-insulating layer of the protection frame in the length direction of the movable protection frame, sealing the temperature control shed again, opening a plurality of fan heaters (17), heating the temperature control shed again, and increasing the temperature of the track slab die cavity and the temperature of the track slab body until the temperature of the track slab die cavity is higher than 5 ℃;
step five, heating the die cavity: a plurality of heating stove hot water pipes (4) are respectively arranged on the top surface and the side surface of the track slab (3), and one ends of the plurality of heating stove hot water pipes (4) are respectively connected with the electric heating stove (18);
preheating the exhaust port of the track slab before the track slab is poured, and plugging the pouring hole and the observation hole of the track slab when the exhaust port of the track slab is preheated;
step six, controlling the mold-entering temperature of the self-compacting concrete and pouring the track slab, wherein the process is as follows:
step 601, according to the formula
step 602, according to formula T1＝T0-0.16(T0-Tp) Calculating the machine-out temperature T of the self-compacting concrete1Wherein, TpIs the ambient temperature of the stirrer;
step 603, according to the formula T2＝T1-(bt+0.32n)(T1-Tm) Calculating the temperature T of the self-compacting concrete from transportation to pouring2Wherein b is the temperature loss coefficient, T is the time length from the transportation to the pouring of the self-compacting concrete, n is the transportation frequency of the self-compacting concrete, and TmIs the outside ambient temperature;
step 604, forming a shed roof pouring hole in a protective frame heat insulation layer on the top of the temperature control shed, and opening a track plate pouring hole, wherein the temperature in the temperature control shed is reduced by 4-7 ℃, and the temperature of a track plate die cavity is reduced by 0.5-1 ℃;
step 605, according to the formula
Calculating the mold-entering temperature T of the self-compacting concrete3Wherein, CcSpecific heat capacity of self-compacting concrete, McWeight per cubic meter of self-compacting concrete, CsIs the specific heat capacity of the die, MsThe weight of the mould at the junction with each cubic meter of concrete, TnIs the temperature of the mold;
step 606, pouring self-compacting concrete, and after pouring, blocking the shed roof pouring hole and the track slab pouring hole to finish the pouring of the track slab;
after the track slab filling pipe is pulled out, installing a plurality of concrete core temperature measuring elements, embedding the temperature measuring elements in the middle of the self-compacting concrete layer, and periodically recording temperature data;
step seven, maintaining the track slab with the mold: self-compaction concrete fills the completion, fills the pipe and extracts the back with anti-overflow pipe, continues to adopt electric fan heater and electric heating stove to keep warm to at bed plate (2), track board (3), heating stove hot-water line (4) on cover track heat preservation (5) and carry out the maintenance, track heat preservation (5) wrap up track board (3) completely, realize track board area mould heat preservation maintenance of moisturizing.
2. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 1, characterized in that: remove protection frame include along III plate-type ballastless track length direction of CRTS a plurality of braced frames that set gradually and with a plurality of braced frames connect many longitudinal tie (8) as an organic whole, braced frame includes horizontal pole (7) and installs many montants (6) in horizontal pole (7) bottom, universal wheel (9) are installed to montant (6) bottom.
3. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 1, characterized in that: the protective frame heat-insulating layer comprises a plastic heat-insulating film (10), a cotton quilt heat-insulating layer (11) and a waterproof flame-retardant protective layer (12) which are sequentially paved from bottom to top.
4. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 3, characterized in that: the bottom of the plastic heat-insulating film (10) is pressed tightly through a weight block (13).
5. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 1, characterized in that: the track heat-insulating layer (5) comprises heat-insulating films covering the plurality of heating stove hot water pipes (4) and heat-insulating quilts covering the heat-insulating films, and the heat-insulating films are plastic heat-insulating films.
6. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 2, characterized in that: the quantity of montant (6) among the braced frame is four, and two montants (6) in four montants (6) are located respectively between base plate (2) and the sleeper (16) of corresponding side, and two other montants (6) in four montants (6) are located between two base plates (2), are provided with the bracing between montant (6) and horizontal pole (7).
7. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 1, characterized in that: the length of the movable protection frame is not less than the single span length of the bridge.
8. The method for controlling the temperature of the bridge segment CRTS III slab ballastless track in the winter construction according to claim 1, characterized in that: in step 606, when self-compacting concrete is poured, a square hole of 80cm × 80cm is formed right above the track slab pouring hole so that workers can control the concrete flow in the charging bucket conveniently; and (5) plugging the square hole after the self-compacting concrete is poured.
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| CN202010817996.0A CN111962341A (en) | 2020-08-14 | 2020-08-14 | Temperature control method for winter construction of bridge segment CRTS III plate type ballastless track |
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| CN202010817996.0A CN111962341A (en) | 2020-08-14 | 2020-08-14 | Temperature control method for winter construction of bridge segment CRTS III plate type ballastless track |
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| CN114153250A (en) * | 2021-10-12 | 2022-03-08 | 深圳大学 | Track temperature regulation and control system |
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Application publication date: 20201120 |