CN113582719A - High-temperature maintenance method and preparation method of tubular pile - Google Patents
High-temperature maintenance method and preparation method of tubular pile Download PDFInfo
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- CN113582719A CN113582719A CN202110713834.7A CN202110713834A CN113582719A CN 113582719 A CN113582719 A CN 113582719A CN 202110713834 A CN202110713834 A CN 202110713834A CN 113582719 A CN113582719 A CN 113582719A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012423 maintenance Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000001723 curing Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims description 38
- 239000004567 concrete Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 11
- 229920006395 saturated elastomer Polymers 0.000 description 11
- 239000004568 cement Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 8
- 238000005485 electric heating Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 208000012322 Raynaud phenomenon Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- 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
- C04B40/024—Steam hardening, e.g. in an autoclave
- C04B40/0245—Steam hardening, e.g. in an autoclave including a pre-curing step not involving a steam or autoclave treatment
Abstract
The invention discloses a high-temperature maintenance method and a preparation method of a tubular pile, wherein the high-temperature maintenance method comprises the following steps: s11, placing the pipe pile subjected to normal-pressure steam curing and demolding in a sealed container; s12, keeping the temperature in the sealed container at 170-190 ℃ in a first preset time under normal pressure for a second preset time, wherein the first preset time is less than or equal to 1 h; and S13, taking the pipe pile out of the sealed container. The high-temperature curing method has short production time and low cost.
Description
Technical Field
The invention relates to the technical field of tubular piles, in particular to a tubular pile high-temperature maintenance method and a preparation method.
Background
The conventional high-temperature curing method of the PHC tubular pile is a high-temperature high-pressure steam curing method, and comprises the following specific steps: and (2) putting the tubular pile into an autoclave, introducing high-pressure steam into the autoclave at a certain speed until the steam pressure reaches about 1.0MPa (at the moment, the temperature is about 180 ℃, the time is about 1-1.5 hours), curing for 4-6 hours at a constant pressure of 1.0MPa (180 ℃), exhausting and cooling for about 1.5 hours, and taking out the tubular pile from the autoclave and putting the tubular pile into a heat-preservation shed for cooling after high-temperature curing is completed.
The reasons for the need for the high temperature and high pressure steam curing method are: the strength of the PHC tubular pile produced in industry needs to reach above C80 quickly, which requires that the tubular pile concrete is hydrated to generate tobermorite crystal structure with high strength, and the reaction condition for generating the tobermorite is 180 ℃, and the corresponding saturated steam pressure is 1.0 MPa.
The high-temperature high-pressure steam curing method has the following defects: the high-pressure autoclave is important special equipment in the traditional pipe pile factory, and needs to be stopped for production inspection every year; and the maintenance cost of high-voltage equipment is high; moreover, a large amount of condensed water is generated by saturated vapor pressure curing (when the pressure is 1.0MPa, the temperature of the condensed water is 180 ℃), and a large amount of heat energy is taken away by discharging the condensed water; finally, the discharged condensed water is high-temperature and high-alkalinity, is difficult to utilize, needs environmental protection treatment and causes resource waste.
The current authoritative view, such as "prestressed concrete pipe pile" (raynaud) P96, is that the water content in the pipe pile concrete is very low, "autoclaving is not the temperature requirement, but must also be the saturated vapor pressure," dry baking "is not feasible. "
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-temperature maintenance method for a tubular pile, which has the advantages of simple equipment, safety, reliability, short production time and low cost.
The technical problem to be solved by the invention is to provide a preparation method of a tubular pile, which has the advantages of simple equipment, safety, reliability, short production time and low cost.
In order to solve the technical problem, the invention provides a high-temperature maintenance method of a tubular pile, which comprises the following steps:
s11, placing the pipe pile subjected to normal-pressure steam curing and demolding in a sealed container;
s12, keeping the temperature in the sealed container at 170-190 ℃ in a first preset time under normal pressure for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S13, taking the pipe pile out of the sealed container.
As an improvement of the scheme, the first preset time is 40-50 min.
As an improvement of the scheme, the sealed container comprises a shell and a heating device, the heating device comprises a heating wire or a heat conduction oil pipe, and the heating wire or the heat conduction oil pipe is spirally arranged on the inner wall of the shell so that the temperature in the shell is raised to 170-190 ℃ within 40-50 min.
As an improvement of the scheme, the temperature in the shell is raised to 175-185 ℃ within 40-50 min.
As an improvement of the scheme, the second preset time is 4-5 h.
Correspondingly, the invention also provides a preparation method of the tubular pile, which comprises the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the pipe pile after the mould is removed in a sealed container, keeping the temperature in the sealed container at 170-190 ℃ within a first preset time under normal pressure, and keeping the temperature for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S24, taking the tubular pile out of the sealed container and cooling.
As an improvement of the scheme, in the step S23, the first preset time is 40-50 min.
In step S23, the sealed container includes a housing and a heating device, the heating device includes a heating wire or a heat conducting oil pipe, and the heating wire or the heat conducting oil pipe is spirally disposed on an inner wall of the housing, so that a temperature in the housing is raised to 170-190 ℃ within 40-50 min.
As an improvement of the scheme, the temperature in the shell is raised to 175-185 ℃ within 40-50 min.
As an improvement of the scheme, the second preset time is 4-5 h.
The implementation of the invention has the following beneficial effects:
1) and the maintenance efficiency is improved after implementation:
different from the existing steam pressurizing method, the heating device can enable the temperature in the shell to reach 170-190 ℃ within 40-50 min, and the steam pressurizing method can enable the temperature in the high-pressure kettle to reach 180 ℃ within about 1.5 h.
In addition, in the conventional steam pressurization method, after the high-temperature curing is finished, the air is exhausted for 1.5 hours to reduce the pressure, and the tubular pile can be taken out by opening the autoclave to be cooled.
2) And implementation of later energy saving benefit improvement:
because the sealed container of this application directly heats for the tubular pile to need not steam pressurization, consequently accomplish the back at high temperature maintenance, directly open sealed container and just can take out the tubular pile, effectively shorten the time in whole high temperature maintenance stage, thereby improve the production efficiency of tubular pile.
Under the condition that the number of the pipe piles is the same, the steam consumption of the existing high-temperature high-pressure steam curing method is 10 tons, and the heat energy consumption is about 2.78 x 107kJ; the invention adopts an electric heating mode or a hot oil heating mode, and the heat energy consumption is about 2.05 to 107kJ, 26.2% energy savings over existing processes.
Drawings
FIG. 1 is a flow chart of the high-temperature curing method of the tubular pile of the invention;
fig. 2 is a flow chart of the preparation method of the tubular pile of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.
Referring to fig. 1, the high-temperature maintenance method for the tubular pile provided by the invention comprises the following steps:
s11, placing the pipe pile subjected to normal-pressure steam curing and demolding in a sealed container;
s12, keeping the temperature in the sealed container at 170-190 ℃ in a first preset time under normal pressure for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S13, taking the pipe pile out of the sealed container.
Specifically, sealed container includes casing and heating device, heating device includes heater strip or heat conduction oil pipe, heater strip or heat conduction oil pipe spiral setting are at the inner wall of casing, can let the inside temperature of casing reach 180 ℃ fast.
The first preset time is preferably 40-50 min, namely the temperature in the sealed container reaches 170-190 ℃ within 40-50 min.
Preferably, the temperature in the sealed container reaches 175-185 ℃ within 40-50 min under normal pressure.
Preferably, the temperature in the sealed container reaches 180 ℃ within 40-50 min under normal pressure.
Wherein the second preset time is 4-5 h, namely the tubular pile is subjected to heat preservation for 4-5 h at 170-190 ℃. Preferably, the second preset time is 4.5 h.
Different from the existing steam pressurizing method, the heating device can enable the temperature in the shell to reach 170-190 ℃ within 40-50 min, and the steam pressurizing method can enable the temperature in the high-pressure kettle to reach 180 ℃ within about 1.5 h.
In addition, in the conventional steam pressurization method, after the high-temperature curing is finished, the air is exhausted for 1.5 hours to reduce the pressure, and the tubular pile can be taken out by opening the autoclave to be cooled.
Because the sealed container of this application directly heats for the tubular pile to need not steam pressurization, consequently accomplish the back at high temperature maintenance, directly open sealed container and just can take out the tubular pile, effectively shorten the time in whole high temperature maintenance stage, thereby improve the production efficiency of tubular pile.
Preferably, the shell of the sealed container is provided with a heat insulation layer, and the heat insulation layer can accurately maintain the temperature in the shell within a preset temperature range.
Wherein, the heat-insulating layer is made of heat-insulating material, and the invention is not limited in particular.
Specifically, the heating device directly heats the air in the container, conversion of heat energy-water-steam is not needed, the heating speed is high, the heating time is short, and the heating efficiency of the tubular pile is effectively improved.
When the temperature in the container is raised to the set temperature (180 ℃), the heating device is closed after the temperature is maintained for the second time, the container is directly opened, the tubular pile is taken out, no condensed water exists in the container, the drainage time is effectively saved, and the energy is also saved.
Under the condition that the number of the pipe piles is the same, the steam consumption of the existing high-temperature high-pressure steam curing method is 10 tons, and the heat energy consumption is about 2.78 x 107kJ; the invention adopts an electric heating mode or a hot oil heating mode, and the heat energy consumption is about 2.05 to 107kJ, 26.2% energy savings over existing processes.
The existing steam pressurizing method only considers the problems of low water-cement ratio of the PHC pipe pile and water for cement hydration, but does not consider the following two problems: (1) the reaction of hydration of the cement which consumes the most water into C-S-H gel is completed in normal pressure saturated steam curing (normal pressure steam curing); (2) the normal pressure saturated steam curing (normal pressure steam curing) brings sufficient moisture into the pile body; therefore, in the high-temperature curing stage, the water does not need to be supplemented to the pipe pile.
The theoretical basis of the invention is that the water for curing the PHC tubular pile in the high-pressure kettle is sufficient, because the cement C-S-H gel reaction with more water demand is completed through normal-pressure saturated steam curing, and the PHC tubular pile concrete contains a large amount of water which is enough to provide the water required by the tobermorite reaction, and only the reaction temperature needs to be reached, and high pressure and saturated steam are not needed.
Referring to fig. 2, the invention also provides a preparation method of the tubular pile, which comprises the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the pipe pile after the mould is removed in a sealed container, keeping the temperature in the sealed container at 170-190 ℃ within a first preset time under normal pressure, and keeping the temperature for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S24, taking the tubular pile out of the sealed container and cooling.
Specifically, sealed container includes casing and heating device, heating device includes heater strip or heat conduction oil pipe, heater strip or heat conduction oil pipe spiral setting are at the inner wall of casing, can let the inside temperature of casing reach 180 ℃ fast.
Preferably, the first preset time is 40-50 min, namely the temperature in the sealed container reaches 170-190 ℃ within 40-50 min.
Preferably, the temperature in the sealed container reaches 175-185 ℃ within 40-50 min under normal pressure.
Preferably, the temperature in the sealed container reaches 180 ℃ within 40-50 min under normal pressure.
Wherein the second preset time is 4-5 h, namely the tubular pile is subjected to heat preservation for 4-5 h at 170-190 ℃. Preferably, the second preset time is 4.5 h.
Different from the existing steam pressurization method, the heating device can reach the temperature in the shell to 180 ℃ within 40-50 min, and the steam pressurization method can reach the temperature in the high-pressure kettle to 180 ℃ within about 1.5 h.
In addition, in the conventional steam pressurization method, after the high-temperature curing is finished, the air is exhausted for 1.5 hours to reduce the pressure, and the tubular pile can be taken out by opening the autoclave to be cooled.
Because the sealed container of this application directly heats for the tubular pile to need not steam pressurization, consequently accomplish the back at high temperature maintenance, directly open sealed container and just can take out the tubular pile, effectively shorten the time in whole high temperature maintenance stage, thereby improve the production efficiency of tubular pile.
Preferably, the shell of the sealed container is provided with a heat insulation layer, and the heat insulation layer can accurately maintain the temperature in the shell within a preset temperature range.
Wherein, the heat-insulating layer is made of heat-insulating material, and the invention is not limited in particular.
Specifically, the heating device directly heats the air in the container, conversion of heat energy-water-steam is not needed, the heating speed is high, the heating time is short, and the heating efficiency of the tubular pile is effectively improved.
When the temperature in the container is raised to the set temperature (180 ℃), the heating device is closed after the temperature is maintained for the second time, the container is directly opened, the tubular pile is taken out, no condensed water exists in the container, the drainage time is effectively saved, and the energy is also saved.
Under the condition that the number of the pipe piles is the same, the steam consumption of the existing high-temperature high-pressure steam curing method is 10 tons, and the heat energy consumption is about 2.78 x 107kJ; the invention adopts an electric heating mode or a hot oil heating mode, and the heat energy consumption is about 2.05 to 107kJ, 26.2% energy savings over existing processes.
The existing steam pressurizing method only considers the problems of low water-cement ratio of the PHC pipe pile and water for cement hydration, but does not consider the following two problems: (1) the reaction of hydration of the cement which consumes the most water into C-S-H gel is completed in normal pressure saturated steam curing (normal pressure steam curing); (2) the normal pressure saturated steam curing (normal pressure steam curing) brings sufficient moisture into the pile body; therefore, in the high-temperature curing stage, the water does not need to be supplemented to the pipe pile.
The theoretical basis of the invention is that the water for curing the PHC tubular pile in the high-pressure kettle is sufficient, because the cement C-S-H gel reaction with more water demand is completed through normal-pressure saturated steam curing, and the PHC tubular pile concrete contains a large amount of water which is enough to provide the water required by the tobermorite reaction, and only the reaction temperature needs to be reached, and high pressure and saturated steam are not needed.
The invention will be further illustrated by the following specific examples
Example 1
A preparation method of a tubular pile comprises the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the demolded tubular pile into a sealed container, and keeping the temperature in the sealed container at 170 ℃ within 40min under normal pressure by adopting an electric heating mode for 5 h;
and S24, directly taking the tubular pile out of the sealed container and cooling.
Example 2
A preparation method of a tubular pile comprises the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the demolded tubular pile into a sealed container, and keeping the temperature in the sealed container at 180 ℃ within 45min under normal pressure by adopting an electric heating mode for 4.5 h;
and S24, directly taking the tubular pile out of the sealed container and cooling.
Example 3
A preparation method of a tubular pile comprises the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the demolded tubular pile into a sealed container, heating the tubular pile in the sealed container to 190 ℃ in 50min under normal pressure by adopting a hot oil heating mode, and preserving heat for 4 h;
and S24, directly taking the tubular pile out of the sealed container and cooling.
Comparative example 1
Different from the example 1, in the comparative example 1, the tube pile after being demoulded is placed in an autoclave, the pressure of the autoclave is increased to 1.0MPa (the corresponding temperature in the autoclave is 180 ℃) within 1.5h by adopting a steam pressurizing mode, and the temperature is kept for 4.5 h.
Wherein, after the heat preservation is finished, the pipe pile can be taken out from the autoclave after 1.5h for exhausting and depressurizing.
The pipe piles with the diameter of 500 are prepared according to the preparation methods of the embodiments 1-3 and the comparative example 1, the pipe piles prepared in the embodiments 1-3 and the comparative example 1 are tested according to the standard (pretensioned prestressed concrete pipe pile GB/T13476-2009), 10 pipe piles are taken for each group of tests, and the average value is obtained, and the results are as follows:
| item | Measured intensity (Mpa) |
| Example 1 | 94.7 |
| Example 2 | 94.9 |
| Example 3 | 95.0 |
| Comparative example 1 | 95.0 |
From the results, in the examples 1 to 3 and the comparative example 1, the cooling processes in the step S21, the step S22 and the step S24 are completely consistent, and the prepared tubular pile has a small strength difference, which can be considered as basically consistent, wherein the time in the step S23 in the examples 1 to 3 is only 4h50min to 5h40min, the time in the comparative example 1 is 7.5h, the production time is saved by 2 h to 3h, and the production efficiency is greatly improved; in addition, the heat energy consumption of step S23 in examples 1 to 3 was about 2.05 × 107kJ, heat energy consumption of about 2.78 x 10 for step S23 in comparative example 17kJ; the energy is saved by 26.2 percent, and the cost is greatly reduced.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A high-temperature maintenance method for a tubular pile is characterized by comprising the following steps:
s11, placing the pipe pile subjected to normal-pressure steam curing and demolding in a sealed container;
s12, keeping the temperature in the sealed container at 170-190 ℃ in a first preset time under normal pressure for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S13, taking the pipe pile out of the sealed container.
2. The method for maintaining the tubular pile at the high temperature according to claim 1, wherein the first predetermined time is 40-50 min.
3. The high-temperature pipe pile curing method of claim 2, wherein the sealed container comprises a shell and a heating device, the heating device comprises a heating wire or a heat conducting oil pipe, and the heating wire or the heat conducting oil pipe is spirally arranged on the inner wall of the shell so that the temperature in the shell is increased to 170-190 ℃ within 40-50 min.
4. The method for maintaining the tubular pile at the high temperature according to claim 3, wherein the temperature in the shell is raised to 175-185 ℃ within 40-50 min.
5. The method for maintaining the tubular pile at the high temperature according to claim 1, wherein the second preset time is 4-5 hours.
6. The preparation method of the tubular pile is characterized by comprising the following steps:
s21, distributing concrete into a reinforcement cage, closing the mold, pre-stressing, stretching and centrifugally forming;
s22, performing standing maintenance, normal-pressure steam maintenance and mold removal on the formed pipe pile;
s23, placing the pipe pile after the mould is removed in a sealed container, keeping the temperature in the sealed container at 170-190 ℃ within a first preset time under normal pressure, and keeping the temperature for a second preset time, wherein the first preset time is less than or equal to 1 h;
and S24, taking the tubular pile out of the sealed container and cooling.
7. The method for preparing a tubular pile according to claim 6, wherein in step S23, the first preset time is 40-50 min.
8. The method for preparing a tubular pile according to claim 7, wherein in step S23, the sealed container comprises a housing and a heating device, the heating device comprises a heating wire or a heat conducting oil pipe, and the heating wire or the heat conducting oil pipe is spirally arranged on the inner wall of the housing, so that the temperature in the housing is increased to 170-190 ℃ within 40-50 min.
9. The method for preparing the tubular pile according to claim 8, wherein the temperature in the shell is raised to 175-185 ℃ within 40-50 min.
10. The preparation method of the tubular pile according to claim 6, wherein the second preset time is 4-5 hours.
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| CN202110713834.7A CN113582719A (en) | 2021-06-25 | 2021-06-25 | High-temperature maintenance method and preparation method of tubular pile |
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| CN202110713834.7A CN113582719A (en) | 2021-06-25 | 2021-06-25 | High-temperature maintenance method and preparation method of tubular pile |
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| CN101992501A (en) * | 2010-09-30 | 2011-03-30 | 中交第三航务工程局有限公司 | Method for making high-endurance and low-brittleness PHC pipe pile |
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| CN109159270A (en) * | 2018-09-06 | 2019-01-08 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of solar heating and thermal insulating maintenance process for railway concrete prefabricated components |
| CN109397510A (en) * | 2018-10-25 | 2019-03-01 | 双威管桩（珠海）有限公司 | One kind is exempted to press steam-curing concrete PHC tubular pole and preparation method thereof |
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2021
- 2021-06-25 CN CN202110713834.7A patent/CN113582719A/en active Pending
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Application publication date: 20211102 |