CN111873159A - Shield segment concrete electric heating maintenance device and method - Google Patents
Shield segment concrete electric heating maintenance device and method Download PDFInfo
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- CN111873159A CN111873159A CN202010911108.1A CN202010911108A CN111873159A CN 111873159 A CN111873159 A CN 111873159A CN 202010911108 A CN202010911108 A CN 202010911108A CN 111873159 A CN111873159 A CN 111873159A
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- shield segment
- heating
- electric heating
- segment concrete
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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 provides a shield segment concrete electric heating maintenance device which comprises a plurality of heating strips, wherein the heating strips are laid on a heat conduction layer made of heat conduction materials, a heat insulation layer made of heat insulation materials is covered on the heat conduction layer, the heating strips are positioned between the heat conduction layer and the heat insulation layer, the heat conduction materials and the heat insulation materials are soft materials, electrified interfaces are arranged on the heating strips, a plurality of temperature sensors are arranged at intervals among the heating strips, the temperature sensors are electrically connected with a temperature controller, and the temperature controller can respectively control the on-off state of each heating strip interface. Compared with an independent curing kiln or a long-line steam curing kiln, the invention has the advantages that the energy is saved, the curing cost of the shield segment concrete is reduced, and the curing quality and the strength of the shield segment are improved.
Description
Technical Field
The invention relates to the technical field of concrete prefabricated part maintenance, in particular to a shield segment concrete electric heating maintenance device and method.
Background
With the increase of the number of motor vehicles in China, the ground traffic is difficult to meet the travel requirements of people, and the urban traffic is inevitably developed to subway construction. The subway construction is mainly characterized in that the construction of the shield tunnel is performed, the segment serves as one of main structures of the shield tunnel and has the functions of bearing the pressure of a soil body, the pressure of underground water and other loads, the quality of the shield segment is directly related to the overall quality and safety of the whole subway engineering, and the waterproof and durability performances of the tunnel are affected. The shield segment serves as a large prefabricated part, the requirement for accelerating the turnover of the mold and improving the production efficiency also exists, at present, domestic main concrete segments are maintained by steam, the hardening process of the concrete is accelerated by the steam, the early strength of the concrete is improved, the segment concrete can quickly reach the lifting demolding strength, the turnover of the mold is accelerated, the production efficiency of the segments is improved, and for example, the patent CN109676774A provides an efficient precast concrete shield segment steam curing cellar and an application method thereof. However, the curing kiln for steam curing needs to heat air to a required temperature, and since the efficiency of air as a heat transfer medium is low, heat is easily dissipated, which causes a large energy loss in a paradigm of steam curing, and further causes a problem of high curing cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a scheme for maintaining shield segment concrete by electric heating so as to reduce the cost of maintaining shield segment concrete.
In order to achieve the purpose, the invention provides a shield segment concrete electric heating maintenance device which comprises a plurality of heating strips, wherein the heating strips are all laid on a heat conduction layer made of heat conduction materials, a heat insulation layer made of heat insulation materials covers the heat conduction layer, the heating strips are located between the heat conduction layer and the heat insulation layer, the heat conduction materials and the heat insulation materials are made of soft materials, electrified interfaces are arranged on the heating strips, a plurality of temperature sensors are arranged at intervals among the heating strips, the temperature sensors are all electrically connected with a temperature controller, and the temperature controller can respectively control the on-off state of each heating strip interface.
Further, the heating strips are transversely laid on the heat conduction layer side by side.
Further, the heat conduction material is a heat conduction silica gel sheet, and the heat preservation material is heat preservation cellucotton.
Further, the arrangement distance of the heating strips is 0.15-0.20m, the heating power of the heating strips is 100W/m, and 2-3 temperature sensors are uniformly arranged at the gap between every two adjacent heating strips.
The invention also provides a shield segment concrete electric heating maintenance method, which comprises the following steps:
attaching an electric heating maintenance device to the upper surface of shield segment concrete and the lower surface of a mold;
step two, the electric heating maintenance device is completely electrified, and the shield segment concrete is heated and maintained for a period of time;
step three, after the detected average temperature rises to the preset temperature, the electric heating maintenance device is powered off, the constant temperature process of the shield segment concrete is carried out, and the process is completed through the intermittent power-on of the electric heating maintenance device;
and fourthly, after the temperature is kept constant, opening the electric heating maintenance device on the upper surface of the shield segment concrete to cool the shield segment concrete in the air for a period of time, and then demolding to finish the initial maintenance.
After the shield segment concrete in the mold is formed and the surface of the concrete is initially set, a layer of film for maintenance is covered, and then the step one is carried out.
The heating power of the electric heating maintenance device on the upper surface of the shield segment concrete and the lower surface of the mold is different, the heating power of the upper surface is 2000W, and the heating power of the lower surface is 1000W.
And C, heating for 2-3h in the step II, detecting the temperature every 20min, and ensuring that the rising amplitude of the temperature every 20min does not exceed 15 degrees, otherwise, powering off and placing for a period of time.
Wherein the preset temperature in the third step is 50 degrees, the temperature detection is carried out every 20min in the constant temperature process, when the temperature is below 45 degrees, the power is supplied again for heating, when the temperature is 50 degrees, the power is cut off again for keeping constant temperature, and the whole constant temperature process lasts for 3 hours.
Wherein, shield segment concrete cools down 1h in the air in step four, then the drawing of patterns, and the electric heating curing means of shield segment concrete upper surface directly lifts off after using up and hangs, and the electric heating curing means of mould lower surface follows the mould operation.
The scheme of the invention has the following beneficial effects:
the invention provides an electric heating mode for carrying out initial maintenance on shield segment concrete, an electric heating maintenance device attached to the shield segment concrete is used for heating and maintaining the shield segment concrete, a heat preservation layer consisting of heat preservation fiber cotton can well reduce heat loss, and simultaneously heat is ensured to be uniformly conducted to the surface of the concrete under the action of a heat conduction silicon sheet of a heat conduction layer.
The electric heating curing device can be repeatedly used, the production cost of the device is lower than the cost of building curing kilns, boilers and the like, the daily use and maintenance cost is also lower, no pollution gas is discharged, the electric heating curing device is an energy-saving and environment-friendly heating curing device, the use and the operation are convenient, and the reliability and the safety are high.
Drawings
FIG. 1 is a schematic structural view of an electric heating curing device according to the present invention;
fig. 2 is a schematic diagram of shield segment concrete and a mold.
[ description of reference ]
1-a mould; 2-shield segment concrete; 3-heating the strip; 4-heat conducting silica gel sheet; 5-heat preservation cellucotton; 6-temperature sensor; 7-temperature controller.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
as shown in fig. 1 and 2, embodiment 1 of the present invention provides an electric heating maintenance device for shield segment concrete, which mainly cooperates with a segment mold 1 to heat and maintain the surface of the shield segment concrete 2 after the shield segment concrete 2 is formed, so as to accelerate the hardening process of the concrete, so that the shield segment concrete 2 can quickly reach the lifting demolding strength, and the segment manufacturing and mold 1 use efficiency can be improved.
The electric heating maintenance device comprises a plurality of heating strips 3 which are distributed side by side, the heating strips 3 are all laid on a heat-conducting silicon sheet 4, and the heat-conducting silicon sheet 4 is used as a heat-conducting layer. Meanwhile, the heat-conducting silica gel sheet 4 is covered with a layer of heat-insulating cellucotton 5, so that the heating strip 3 is positioned between the heat-insulating cellucotton 5 and the heat-conducting silica gel sheet 4, and the heat-insulating cellucotton 5 is used as a heat-insulating layer. Because the heat-conducting silica gel sheet 4 and the heat-insulating fiber cotton 5 are soft materials, the manufactured electric heating maintenance device is similar to a carpet, and can be conveniently attached to the surface of the shield segment concrete 2 or the mold 1. Wherein, heat conduction silica gel piece 4 and the laminating of shield structure section of jurisdiction concrete 2 surface or mould 1 ensure that the heat can more evenly step to shield structure section of jurisdiction concrete 2 surface, avoid producing temperature gradient, and the heat preservation of heat preservation cellucotton 5 is located the outside and keeps warm, reduces calorific loss and promotes heating maintenance efficiency.
The heating strip 3 is provided with an electrified interface, and electric energy is converted into heat energy for heating after the heating strip is electrified. In addition, the interval of two adjacent heating strips 3 all is provided with temperature sensor 6, and temperature sensor 6 is located between heat-conducting layer and the heat preservation equally, and all temperature sensor 6 all are connected with a temperature controller 7 electricity, through the temperature of the heating strip 3 position at its place of temperature sensor 6 real-time supervision to control the heating temperature of every heating 3 respectively, make it controllable to the heating on shield structure section of jurisdiction concrete 2 surface, temperature distribution is more even, in order to improve section of jurisdiction heating maintenance quality.
In a preferred embodiment, the arrangement pitch of the heating strips 3 is 0.18m, the heating power consumption specification of the heating strips 3 is preferably 100W/m, and 2-3 temperature sensors 6 are arranged at the gap between two adjacent heating strips 3 to ensure that the obtained temperature data are stable and reliable. In addition, an earth leakage protection or grounding device is preferably arranged to avoid electric shock of an operator.
Example 2:
referring to fig. 1 and 2 again, embodiment 2 of the present invention provides a shield segment concrete electric heating maintenance method, including the following steps:
step one, after the shield segment concrete 2 in the mold 1 is molded and the surface of the concrete is initially set, covering a curing film, and respectively sticking and covering an electric heating curing device to the upper surface of the shield segment concrete 2 and the lower surface of the mold 1.
And step two, the electric heating maintenance device is completely electrified to heat and maintain the shield segment concrete 2, wherein the heating power of the upper surface of the shield segment concrete 2 is different from that of the lower surface of the mould 1, the heating power of the upper surface is 2000W, the heating power of the lower surface is 1000W, the heating is continuously carried out for 2-3h, the temperature is detected every 20min, the rising amplitude of the temperature every 20min is not more than 15 degrees, and otherwise, the electric heating maintenance device is powered off and is placed for a period of time.
And step three, powering off the electric heating maintenance device after the temperature rises to 50 degrees to perform a constant temperature process, detecting the temperature every 20min during the constant temperature period, powering on again to heat when the temperature is below 45 degrees, powering off again to keep the temperature when the temperature reaches 50 degrees, and continuing the whole process for 3 hours. Wherein, the temperature is monitored by a temperature sensor 6, and the power-off or power-on is controlled by a temperature controller 7.
And step four, after the constant temperature is finished, opening the electric heating maintenance device on the upper surface of the shield segment concrete 2 to cool the shield segment concrete 2 in the air for 1h, and then demoulding. Wherein, the electric heating curing means of shield segment concrete 2 upper surface directly lifts after using, waits to use next time, and the electric heating curing means of mould 1 lower surface can follow mould 1 and move.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a shield constructs section of jurisdiction concrete electrical heating curing means, a serial communication port, includes many heating strips, the heating strip is all laid on a heat-conducting layer of being made by the heat conduction material, cover the heat preservation that the one deck was made by insulation material on the heat-conducting layer, the heating strip is located the heat-conducting layer with between the heat preservation, the heat conduction material with insulation material is soft material, be provided with the interface of circular telegram on the heating strip, interval department between the heating strip is provided with a plurality of temperature sensor, temperature sensor all is connected with a temperature controller electricity, every can be controlled respectively by the temperature controller the break-make electric state of heating strip interface.
2. The shield segment concrete electric heating maintenance device according to claim 1, wherein the heating strips are transversely laid on the heat conduction layer side by side.
3. The shield segment concrete electric heating maintenance device according to claim 1, wherein the heat conduction material is a heat conduction silica gel sheet, and the heat insulation material is heat insulation fiber cotton.
4. The shield segment concrete electric heating maintenance device according to claim 2, wherein the arrangement distance of the heating strips is 0.15-0.20m, the heating power of the heating strips is 100W/m, and 2-3 temperature sensors are uniformly arranged at the gap between every two adjacent heating strips.
5. An electric heating maintenance method for shield segment concrete, which is applied to the electric heating maintenance device of any one of claims 1 to 4, and is characterized by comprising the following steps:
attaching an electric heating maintenance device to the upper surface of shield segment concrete and the lower surface of a mold;
step two, the electric heating maintenance device is completely electrified, and the shield segment concrete is heated and maintained for a period of time;
step three, after the detected average temperature rises to the preset temperature, the electric heating maintenance device is powered off, the constant temperature process of the shield segment concrete is carried out, and the process is completed through the intermittent power-on of the electric heating maintenance device;
and fourthly, after the temperature is kept constant, opening the electric heating maintenance device on the upper surface of the shield segment concrete to cool the shield segment concrete in the air for a period of time, and then demolding to finish the initial maintenance.
6. The shield segment concrete electric heating maintenance method according to claim 5, characterized in that after the shield segment concrete in the mold is formed and the surface of the concrete is initially set, a layer of film for maintenance is covered, and then the first step is carried out.
7. The shield segment concrete electric heating maintenance method according to claim 5, wherein the heating powers of the electric heating maintenance devices on the upper surface of the shield segment concrete and the lower surface of the mold are different, the heating power of the upper surface is 2000W, and the heating power of the lower surface is 1000W.
8. The shield segment concrete electric heating maintenance method according to claim 5, wherein the heating time in the second step is 2-3h, and meanwhile, the temperature detection is carried out every 20min, so that the rising amplitude of the temperature every 20min is not more than 15 degrees, otherwise, the shield segment concrete electric heating maintenance method is powered off and placed for a period of time.
9. The shield segment concrete electric heating maintenance method according to claim 5, wherein the preset temperature in the third step is 50 degrees, the temperature detection is carried out every 20min in the constant temperature process, when the temperature is below 45 degrees, the power is turned on again for heating, when the temperature is 50 degrees, the power is turned off again for constant temperature, and the whole constant temperature process lasts for 3 hours.
10. The shield segment concrete electric heating maintenance method according to claim 5, characterized in that in the fourth step, the shield segment concrete is cooled for 1 hour in the air, then the mold is removed, the electric heating maintenance device on the upper surface of the shield segment concrete is directly lifted after use, and the electric heating maintenance device on the lower surface of the mold runs along with the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010911108.1A CN111873159A (en) | 2020-09-02 | 2020-09-02 | Shield segment concrete electric heating maintenance device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010911108.1A CN111873159A (en) | 2020-09-02 | 2020-09-02 | Shield segment concrete electric heating maintenance device and method |
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| Publication Number | Publication Date |
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| CN111873159A true CN111873159A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010911108.1A Pending CN111873159A (en) | 2020-09-02 | 2020-09-02 | Shield segment concrete electric heating maintenance device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610007A (en) * | 2020-12-17 | 2021-04-06 | 赵佳康 | Bulky concrete automatic control health preserving and insulation construction |
| CN113187254A (en) * | 2021-04-23 | 2021-07-30 | 中国建筑第八工程局有限公司 | Stretching and heating device and method for slow-bonding prestressed tendon |
| CN114478063A (en) * | 2022-02-28 | 2022-05-13 | 河北工业大学 | Gradient temperature electric stimulation curing method for concrete in cold region in winter |
-
2020
- 2020-09-02 CN CN202010911108.1A patent/CN111873159A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610007A (en) * | 2020-12-17 | 2021-04-06 | 赵佳康 | Bulky concrete automatic control health preserving and insulation construction |
| CN113187254A (en) * | 2021-04-23 | 2021-07-30 | 中国建筑第八工程局有限公司 | Stretching and heating device and method for slow-bonding prestressed tendon |
| CN114478063A (en) * | 2022-02-28 | 2022-05-13 | 河北工业大学 | Gradient temperature electric stimulation curing method for concrete in cold region in winter |
| CN114478063B (en) * | 2022-02-28 | 2023-02-07 | 河北工业大学 | Gradient temperature electric stimulation curing method for concrete in cold region in winter |
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