CN115464757A - Construction heat preservation and health maintenance method for cantilever cast-in-place bridge in cold low-temperature area - Google Patents
Construction heat preservation and health maintenance method for cantilever cast-in-place bridge in cold low-temperature area Download PDFInfo
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- CN115464757A CN115464757A CN202211084327.2A CN202211084327A CN115464757A CN 115464757 A CN115464757 A CN 115464757A CN 202211084327 A CN202211084327 A CN 202211084327A CN 115464757 A CN115464757 A CN 115464757A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
Abstract
The invention relates to the technical field of bridge cast-in-place box girder construction, in particular to a heat preservation and maintenance method for cantilever cast-in-place bridge construction in cold low-temperature areas, which comprises the following steps: sticking flame-retardant extruded sheets on the outer surfaces of a flange plate, a side mold and a bottom mold of a hanging basket template, laying a hot water circulating pipeline on the outer side of the flame-retardant extruded sheets, fixing the extruded sheets and the hot water circulating pipeline on longitudinal and transverse ribs of the template by spot welding reinforcing steel bars, wrapping the whole suspended casting section by canvas, heating a beam template and the reinforcing steel bars by an electric hot air gun, arranging temperature measuring points, casting section concrete, covering a film and a cotton quilt with newly cast beam section concrete, plugging two suspended ends of a T-shaped structure of the box beam by fireproof rock wool boards, heating the box chamber by a coal stove, and simultaneously conveying steam and tensioning and grouting into the box chamber by an electric steam generator; the beneficial effects are as follows: the method has simple steps, simple and convenient construction and easy guarantee of construction quality; the invention has good use effect and high practical value.
Description
Technical Field
The invention relates to the technical field of bridge cast-in-place box girder construction, in particular to a heat preservation and health maintenance method for cantilever cast-in-place bridge construction in cold low-temperature areas.
Background
According to the standard, when the average temperature of outdoor day and night is continuously 5 days and is stably lower than 5 ℃, the winter construction is carried out. Because the box girder of the hanging basket suspension casting construction in winter is a space structure which is located at high altitude and continuously moves, the concrete is more difficult to transport and pour, the construction risk is larger, and the investment is higher. Therefore, a method which has the advantages of simple steps, convenience in construction, good economy, high safety and easiness in ensuring the construction quality is needed to ensure the construction of the winter box girder hanging basket cantilever cast-in-place.
Disclosure of Invention
The invention aims to provide a heat preservation and maintenance method for cantilever cast-in-place bridge construction in cold low-temperature areas, which is a hanging basket cantilever cast-in-place winter construction method integrating three maintenance modes of a heat storage method, a steam heating method and a warm shed heating method.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction heat preservation and maintenance method for cantilever cast-in-place bridges in cold low-temperature areas is characterized by comprising the following steps:
step one, pasting flame-retardant extruded sheets on the outer surfaces of a flange plate, a side mold and a bottom mold of a hanging basket template: the flame-retardant extruded sheet is embedded between the longitudinal ribs and the transverse ribs of the template;
step two, laying a hot water circulating pipeline outside the flame-retardant extruded sheet: arranging hot water circulating pipelines at the outer side of the flame-retardant extruded sheet at intervals of 25cm, and conveying hot water through a hot water boiler to perform circulating heating so as to keep the temperature of the space outside the template;
step three, fixing the extruded sheet and the hot water circulating pipeline on the longitudinal and transverse ribs of the template by spot welding the reinforcing steel bars: fixing the phi 8 steel bar and the longitudinal and transverse ribs of the template by spot welding;
step four, wrapping the whole suspended casting segment by canvas: after the extruded sheet and the hot water circulating pipeline are fixed on the outer surface of the suspension casting section template, the whole suspension casting section template is wrapped by canvas, so that the whole wind shielding effect of the box girder section is ensured, the convection with the outside air is reduced, and the heat storage and preservation effect of the newly cast girder section is ensured;
step five, heating the beam body template and the steel bars by the electric heating air gun: ensuring that the temperature of the template and the steel bar of the concrete is not lower than 5 ℃ before the concrete is poured into the mold, and pouring hot water on the surface of the concrete poured on the cantilever end section of the previous section to ensure that the temperature of the joint part is higher than 5 ℃;
step six, arranging temperature measuring points: before concrete pouring, temperature sensors are arranged in a box girder to serve as temperature measuring points, the temperature measuring points are arranged at the worst heat-preservation position, and the concrete of the girder body is subjected to temperature monitoring in the process of maintenance, namely 1 is arranged on each of the left side and the right side of a flange plate, 1 is arranged in a top plate, 1 is arranged in a bottom plate, 2 is arranged on each of a left web plate and a right web plate, a group of 8 temperature measuring points are adopted, temperature measuring lines are uniformly led into a box chamber, and the temperature measuring lines of the top plate are led out from the top plate;
seventhly, pouring section concrete: the concrete pouring is carried out at a time interval with higher temperature in the daytime, so that the control of the concrete mold-entering temperature is facilitated;
step eight, covering the newly cast beam section concrete by using a film and a cotton quilt: aiming at the thin structure of the box girder flange plate, which is easy to radiate heat and freeze, the top surface of the flange plate is covered with a layer of plastic film, an electric blanket is additionally arranged on the plastic film, and then the plastic film is covered with a cotton quilt to strengthen the heat preservation of the flange plate;
step nine, sealing two cantilever ends of the box girder T structure by adopting fireproof rock wool boards;
step ten, heating by adopting a coal stove in the chamber, and simultaneously conveying steam into the chamber by adopting an electric steam generator: 4 coal furnaces are counted, and a stainless steel water bucket is placed on the top of each coal furnace every day to play roles in humidifying and heating; continuously heating and steaming the interior of the box chamber after pouring, providing humidity by using steam while ensuring the temperature, ensuring that the temperature in the box is not lower than 5 ℃, and keeping the temperature in the box chamber basically constant; in order to prevent coal gas poisoning and over-high carbon dioxide concentration and accelerate the carbonization of concrete, the exhaust pipe of the furnace is required to be led out of the box;
eleven, tensioning and grouting: the method comprises the steps of carrying out tensioning and grouting after the strength of concrete of a hanging basket section meets design requirements, supplying hot water for grouting mixing by adopting a stirring station, ensuring the temperature of slurry to be above 15 ℃ and preventing the influence of overhigh temperature on the slurry, wherein the temperature of structural concrete is not lower than 5 ℃ in the grouting process and in 48 hours after grouting, keeping the temperature until the temperature is kept after grouting and the strength is 25MPa, carrying out pore grouting at normal temperature, preventing the pore grouting from being frozen before the strength reaches 25MPa, and carrying out a grouting test block test by specially adopting low-temperature-resistant grouting material to ensure the grouting quality in order to prevent quality accidents caused by frost damage after box girder concrete grouting.
As a further scheme of the invention: in the step one, the extruded sheet is a B1-grade flame-retardant extruded sheet.
As a further scheme of the invention: in the second step, the hot water circulation pipeline adopts a ground heating pipe with the diameter of 20 mm.
As a further scheme of the invention: in the third step, when the extruded sheet is fixed by spot welding of the phi 8 steel bar, electric sparks are prevented from touching the extruded sheet.
As a further scheme of the invention: in the fourth step, the canvas is a canvas containing cotton, 1 binding belt is respectively arranged at the peripheral distance of 50cm of the canvas, and the binding belts are far away from the edge of the canvas by 30cm so as to ensure that the adjacent canvases are overlapped and do not leak air after being bound; binding canvas at the end part of the cantilever with canvas which is dropped from two sides of the flange plate along the bridge direction to form a closed heat-insulating space; in order to prevent the canvas from being scraped away or damaged by strong wind, the binding belt on the inner side of the canvas is firmly bound with the hanging basket template.
As a further scheme of the invention: in the fifth step, the electric heating air gun is a 30kW industrial air heater.
As a further scheme of the invention: in the sixth step, the temperatures monitored by the temperature sensors are as follows: the outside air temperature, the inside air temperature of the box chamber, the concrete discharging temperature, the concrete mold entering temperature and the temperature of each observation point in the box Liang Shi.
As a further scheme of the invention: in the seventh step, the concrete mold-entering temperature is 5-30 ℃; the pouring time is arranged from 9 am to 16 pm in the daytime; before pouring, the residues on the reinforcing steel bars and the templates need to be cleaned, and the ice and snow are not directly melted for the treatment of the ice and snow, because the directly melted water can be frozen again at low temperature.
As a further scheme of the invention: in step ten, the power of the electric steam generator is 24kW.
Compared with the prior art, the invention has the following beneficial effects:
1. the method has simple steps, simple and convenient construction and easy guarantee of construction quality;
2. the invention has good use effect and high practical value.
Drawings
FIG. 1 is a flow chart of a winter construction method of a constructed cast-in-place box girder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
A construction heat preservation and health preservation technology for cantilever cast-in-place bridges in cold low-temperature areas is shown in figure 1 and comprises the following specific steps:
step one, pasting B1-level flame-retardant extruded sheets on the outer surfaces of a flange plate, a side mold and a bottom mold of a hanging basket template: the flame-retardant extruded sheet is embedded between the longitudinal ribs and the transverse ribs of the template;
step two, laying a hot water circulation pipeline outside the flame-retardant extruded sheet: arranging hot water circulating pipelines at the outer side of the flame-retardant extruded sheet at intervals of 25cm, and conveying hot water through a hot water boiler to perform circulating heating to keep the temperature of the space outside the template; the hot water circulating pipeline adopts a ground heating pipe with the diameter of 20 mm;
step three, fixing the extruded sheet and the hot water circulating pipeline on the longitudinal and transverse ribs of the template by spot welding the reinforcing steel bars: fixing the phi 8 steel bar and the longitudinal and transverse ribs of the template by spot welding; when the extruded sheet is fixed by spot welding of the phi 8 steel bar, electric sparks are prevented from touching the extruded sheet;
step four, the whole suspended casting segment is wrapped by canvas: after the extruded sheet and the hot water circulating pipeline are fixed on the outer surface of the suspended casting section template, the whole suspended casting section template is wrapped by canvas, so that the whole wind shielding effect of the box girder section is ensured, the convection with the outside air is reduced, and the heat storage and heat preservation effect of a newly cast girder section is ensured; the canvas is a canvas containing cotton, 1 binding belt is respectively arranged at the peripheral distance of 50cm of the canvas, and the binding belts are far away from the edge of the canvas by 30cm so as to ensure that the adjacent canvases are overlapped and do not leak air after being bound; binding canvas at the end part of the cantilever with canvas which is dropped from two sides of the flange plate along the bridge direction to form a closed heat-insulating space; in order to prevent the canvas from being scraped away or damaged by strong wind, the binding belt at the inner side of the canvas is firmly bound with the hanging basket template;
step five, heating the beam body template and the steel bars by an electric heating air gun: ensuring that the temperature of the template and the steel bar of the concrete is not lower than 5 ℃ before the concrete is poured into the mold, and pouring hot water on the surface of the concrete poured on the cantilever end section of the previous section to ensure that the temperature of the joint part is higher than 5 ℃; the electric heating air gun is a 30kW industrial air heater;
step six, arranging temperature measuring points: before concrete pouring, temperature sensors are arranged in a box girder to serve as temperature measuring points, the temperature measuring points are arranged at the worst heat-preservation position, and the concrete of the girder body is subjected to temperature monitoring in the process of maintenance, namely 1 is arranged on each of the left side and the right side of a flange plate, 1 is arranged in a top plate, 1 is arranged in a bottom plate, 2 is arranged on each of a left web plate and a right web plate, a group of 8 temperature measuring points are adopted, temperature measuring lines are uniformly led into a box chamber, and the temperature measuring lines of the top plate are led out from the top plate; the temperatures monitored by the temperature sensors are as follows: the outside air temperature, the inside air temperature of the box chamber, the concrete discharging temperature, the concrete mold entering temperature and the temperature of each observation point in the box Liang Shi;
seventhly, pouring section concrete: concrete pouring is carried out at a time interval with higher temperature in the daytime, so that the control of the concrete mold-entering temperature is facilitated, and the concrete mold-entering temperature is 5-30 ℃; the pouring time is arranged from 9 am to 16 pm in the daytime; before pouring, the residues on the reinforcing steel bars and the templates need to be cleaned, and the ice and the snow are treated without being directly melted, because the directly melted water can be frozen again at low temperature;
step eight, covering the newly cast beam section concrete by using a film and a cotton quilt: aiming at the thin structure of the box girder flange plate, which is easy to radiate heat and freeze, the top surface of the flange plate is covered with a layer of plastic film, an electric blanket is additionally arranged on the plastic film, and then the plastic film is covered with a cotton quilt to strengthen the heat preservation of the flange plate;
step nine, sealing two cantilever ends of the box girder T structure by adopting fireproof rock wool boards;
step ten, heating by adopting a coal stove in the chamber, and simultaneously conveying steam into the chamber by adopting an electric steam generator: 4 coal furnaces are counted, and a stainless steel water bucket is placed on the top of each coal furnace every day to play roles in humidifying and heating; continuously heating and steaming the interior of the box chamber after pouring, providing humidity by using steam while ensuring the temperature, ensuring that the temperature in the box is not lower than 5 ℃, and keeping the temperature in the box chamber basically constant; in order to prevent coal gas poisoning and over-high carbon dioxide concentration and accelerate the carbonization of concrete, the exhaust pipe of the furnace is taken out of a box; the power of the electric steam generator is 24kW;
eleven, tensioning and grouting: the method comprises the steps of carrying out tensioning and grouting after the strength of concrete of a hanging basket section meets design requirements, supplying hot water for grouting and mixing by a stirring station, ensuring the temperature of slurry to be above 15 ℃ and simultaneously preventing the slurry from being influenced by overhigh temperature, wherein the temperature of structural concrete is not lower than 5 ℃ in the grouting process and within 48 hours after grouting, keeping the temperature until the temperature is kept to be higher than 5 ℃, stopping after grouting and the strength reaches 25MPa, carrying out pore grouting at normal temperature, and not freezing before the strength reaches 25MPa, carrying out a grouting test block test by specially adopting low-temperature-resistant grouting material to ensure the grouting quality in order to prevent the quality accident that box girder concrete is frozen out after grouting.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A construction heat preservation and health preservation method for cantilever cast-in-place bridges in cold low-temperature areas is characterized by comprising the following steps:
step one, pasting flame-retardant extruded sheets on the outer surfaces of a flange plate, a side mold and a bottom mold of a hanging basket template: the flame-retardant extruded sheet is embedded between the longitudinal ribs and the transverse ribs of the template;
step two, laying a hot water circulation pipeline outside the flame-retardant extruded sheet: arranging hot water circulating pipelines at the outer side of the flame-retardant extruded sheet at intervals of 25cm, and conveying hot water through a hot water boiler to perform circulating heating to keep the temperature of the space outside the template;
step three, fixing the extruded sheet and the hot water circulating pipeline on the longitudinal and transverse ribs of the template by spot welding the reinforcing steel bars: spot welding and fixing the phi 8 steel bar and the longitudinal and transverse ribs of the template;
step four, the whole suspended casting segment is wrapped by canvas: after the extruded sheet and the hot water circulating pipeline are fixed on the outer surface of the suspension casting section template, the whole suspension casting section template is wrapped by canvas, so that the whole wind shielding effect of the box girder section is ensured, the convection with the outside air is reduced, and the heat storage and preservation effect of the newly cast girder section is ensured;
step five, heating the beam body template and the steel bars by an electric heating air gun: ensuring that the temperature of the template and the steel bar of the concrete is not lower than 5 ℃ before the concrete is poured into the mold, and pouring hot water on the surface of the concrete poured on the cantilever end section of the previous section to ensure that the temperature of the joint part is higher than 5 ℃;
step six, arranging temperature measuring points: before concrete pouring, temperature sensors are arranged in a box girder to serve as temperature measuring points, the temperature measuring points are arranged at the worst heat-preservation position, and the concrete of the girder body is subjected to temperature monitoring in the process of maintenance, namely 1 is arranged on each of the left side and the right side of a flange plate, 1 is arranged in a top plate, 1 is arranged in a bottom plate, 2 is arranged on each of a left web plate and a right web plate, a group of 8 temperature measuring points are adopted, temperature measuring lines are uniformly led into a box chamber, and the temperature measuring lines of the top plate are led out from the top plate;
seventhly, pouring section concrete: the concrete pouring is carried out at a time interval with higher temperature in the daytime, so that the control of the concrete mold-entering temperature is facilitated;
step eight, covering the newly cast beam section concrete by using a film and a cotton quilt: aiming at the thin structure at the flange plate of the box girder, which is easy to dissipate heat and freeze, the top surface of the flange plate is firstly covered with a layer of plastic film, then an electric blanket is additionally arranged on the plastic film, and then a quilt is covered to strengthen the heat preservation of the flange plate;
step nine, sealing two cantilever ends of the box girder T structure by adopting fireproof rock wool boards;
step ten, heating by adopting a coal stove in the chamber, and simultaneously conveying steam into the chamber by adopting an electric steam generator: 4 coal furnaces are counted, and a stainless steel water bucket is placed on the top of each coal furnace every day to play roles in humidifying and heating; continuously heating and steaming the interior of the box chamber after pouring, providing humidity by using steam while ensuring the temperature, ensuring that the temperature in the box is not lower than 5 ℃, and keeping the temperature in the box chamber basically constant; in order to prevent coal gas poisoning and over-high carbon dioxide concentration and accelerate the carbonization of concrete, the exhaust pipe of the furnace is required to be led out of the box;
step eleven, tensioning and grouting: the method comprises the steps of carrying out tensioning and grouting after the strength of concrete of a hanging basket section meets design requirements, supplying hot water for grouting mixing by adopting a stirring station, ensuring the temperature of slurry to be above 15 ℃ and preventing the influence of overhigh temperature on the slurry, wherein the temperature of structural concrete is not lower than 5 ℃ in the grouting process and in 48 hours after grouting, keeping the temperature until the temperature is kept after grouting and the strength is 25MPa, carrying out pore grouting at normal temperature, preventing the pore grouting from being frozen before the strength reaches 25MPa, and carrying out a grouting test block test by specially adopting low-temperature-resistant grouting material to ensure the grouting quality in order to prevent quality accidents caused by frost damage after box girder concrete grouting.
2. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in the step one, the extruded sheet is a B1-grade flame-retardant extruded sheet.
3. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in the second step, a ground heating pipe with the diameter of 20mm is adopted as the hot water circulating pipeline.
4. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in the third step, when the phi 8 steel bar is adopted for spot welding and fixing the extruded sheet, electric sparks are prevented from touching the extruded sheet.
5. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in the fourth step, the canvas is a canvas containing cotton, 1 binding belt is respectively arranged at the peripheral distance of 50cm of the canvas, and the binding belts are far away from the edge of the canvas by 30cm so as to ensure that the adjacent canvases are overlapped and do not leak air after being bound; binding canvas at the end part of the cantilever with canvas which is dropped from two sides of the flange plate along the bridge direction to form a closed heat-insulating space; in order to prevent the canvas from being scraped away or damaged by strong wind, the binding belt on the inner side of the canvas is firmly bound with the hanging basket template.
6. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in the fifth step, the electric heating air gun is a 30kW industrial air heater.
7. The construction heat preservation and health maintenance method for the cantilever cast-in-place bridge in the cold low-temperature area according to claim 1, characterized in that: in step six, the temperatures monitored by the temperature sensors are as follows: the outside air temperature, the inside air temperature of the box chamber, the concrete discharging temperature, the concrete mold entering temperature and the temperature of each observation point in the box Liang Shi.
8. The construction heat preservation and health maintenance method for the cantilever cast-in-place bridge in the cold low-temperature area according to claim 1, characterized in that: in the seventh step, the concrete mold-entering temperature is 5-30 ℃; the pouring time is arranged from 9 am to 16 pm in the daytime; before pouring, the residues on the reinforcing steel bars and the templates need to be cleaned, and the ice and snow are not directly melted for the treatment of the ice and snow, because the directly melted water can be frozen again at low temperature.
9. The construction heat preservation and health preservation method for the cantilever cast-in-place bridge in the cold low-temperature area of claim 1, which is characterized in that: in step ten, the power of the electric steam generator is 24kW.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211084327.2A CN115464757A (en) | 2022-09-06 | 2022-09-06 | Construction heat preservation and health maintenance method for cantilever cast-in-place bridge in cold low-temperature area |
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| CN202211084327.2A CN115464757A (en) | 2022-09-06 | 2022-09-06 | Construction heat preservation and health maintenance method for cantilever cast-in-place bridge in cold low-temperature area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117403563A (en) * | 2023-12-15 | 2024-01-16 | 中交一航局第三工程有限公司 | Winter construction method for cast-in-situ continuous beam of bracket |
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2022
- 2022-09-06 CN CN202211084327.2A patent/CN115464757A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117403563A (en) * | 2023-12-15 | 2024-01-16 | 中交一航局第三工程有限公司 | Winter construction method for cast-in-situ continuous beam of bracket |
| CN117403563B (en) * | 2023-12-15 | 2024-04-02 | 中交一航局第三工程有限公司 | Winter construction method for cast-in-situ continuous beam of bracket |
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