CN113956071A - Assembled covering and heat-insulating device for large-volume concrete of bridge pier and using method - Google Patents
Assembled covering and heat-insulating device for large-volume concrete of bridge pier and using method Download PDFInfo
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- CN113956071A CN113956071A CN202111208333.XA CN202111208333A CN113956071A CN 113956071 A CN113956071 A CN 113956071A CN 202111208333 A CN202111208333 A CN 202111208333A CN 113956071 A CN113956071 A CN 113956071A
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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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- 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
- C04B40/0082—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of a rise in temperature, e.g. caused by an exothermic reaction
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention relates to an assembly type covering and heat insulating device for large-volume concrete of a pier and a using method, aiming at the device, the assembly type covering and heat insulating device comprises the following components: the beam is horizontally connected to the upper part of the concrete side formwork; and the heat-insulating roller shutters are arranged along the axial direction of the cross beam and can telescopically cover the concrete side formwork. For the method of use of the invention: s1: when large-volume concrete is poured, the internal and external temperature difference of the concrete is obtained; s2: comparing the temperature difference with a first preset value, and when the temperature difference is not greater than the first preset value, performing S3; s3: the thermal insulation roller shutter is extended to cover the outer wall of the concrete. The invention is beneficial to reducing the internal and external temperature difference of the concrete.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an assembled covering and heat-insulating device for large-volume concrete of a pier.
The invention also relates to a using method of the assembly type covering and heat insulating device for the large-volume concrete of the pier.
Background
The section size of the bridge pier concrete structure is generally larger than 1m, and the bridge pier concrete structure belongs to the category of large-volume concrete structures. Excessive hydration heat is easily generated in the construction process, the structure is cracked, and the durability and the safety of the structure are affected. However, the maintenance conditions of the bridge pier are generally poor, and mainly show the following aspects that (1) the turnover of the bridge pier template is fast, and the template removal time is required to be early; (2) the periphery of the pier structure is exposed in a wind environment, so that the surface is easy to cool, and the internal and external temperature difference is easy to be overlarge; (3) for high piers, the construction and maintenance difficulty is greater. Aiming at the structural characteristics and maintenance difficulty of large-volume concrete basically adopting equal section size, an assembled covering heat-insulating device is developed in a targeted manner to prevent wind and preserve heat so as to achieve the purpose of reducing the temperature difference of the inner surface and improving the construction efficiency.
Bulky concrete heat preservation measure that relates in the patent application with publication number CN213709855U sets up coarse linen layer, plastic film, rubber layer, heated board, heat preservation cotton and heat preservation cloth including the surface, sets up a plurality of heat preservation and keeps warm to bulky concrete, avoids the outer temperature of inhaling simultaneously, and nevertheless the multilayer heat preservation measure is laid loaded down with trivial details, is not convenient for control the temperature of heat preservation.
Disclosure of Invention
The invention aims to provide an assembled covering and heat-insulating device for large-volume concrete of a pier, which is beneficial to reducing the internal and external temperature difference of a large-volume concrete structure.
To achieve the above object, there is provided an assembly type covering and insulating device for mass concrete for bridge piers, comprising:
the beam is horizontally connected to the upper part of the concrete side formwork;
and the heat-insulating roller shutters are arranged along the axial direction of the cross beam and can telescopically cover the concrete side formwork.
As a further improvement of the assembly type covering and heat insulating device for the large-volume concrete of the pier, the inner part of the beam is of a cavity structure and accommodates the telescopic heat insulating roller shutter.
As a further improvement of the assembled covering and heat-insulating device for the large-volume concrete of the pier, the heat-insulating roller shutter comprises:
the aluminum alloy is used as a lifting carrier of the heat-preservation roller shutter and is positioned on the outer surface layer of the heat-preservation roller shutter;
the electric blanket is arranged adjacent to the aluminum alloy and is positioned in the middle layer of the heat-preservation roller shutter;
the waterproof nylon cloth is arranged adjacent to the electric blanket and is positioned on the inner layer of the heat-preservation roller shutter.
As a further improvement of the assembly type covering and heat insulating device for the large-volume concrete of the pier, a plurality of horizontal elastic ropes are arranged in the aluminum alloy at intervals, hanging buckles are arranged at the ends of the elastic ropes, and the adjacent heat insulating roller shutters are connected through the hanging buckles at the ends of the elastic ropes.
The aluminum alloy bottom close to the concrete side formwork is also provided with a hanging buckle, the bottom of the concrete side formwork is provided with a corresponding retaining ring, and the hanging buckle at the aluminum alloy bottom can be connected with the retaining ring at the bottom of the concrete side formwork in a buckling manner.
As a further improvement of the assembly type covering and heat insulating device for the large-volume concrete of the pier, the cross beam is connected to the upper part of the concrete side formwork through a positioning device, and the positioning device comprises:
the hanging buckle is connected to the cross beam;
and the retaining ring is connected to the upper part of the concrete side formwork and is connected with the hanging buckle in a buckling manner.
As a further improvement of the assembly type covering and heat insulating device for the large-volume concrete of the pier, the heat insulating roller shutter is electrically connected with a control system, and the control system comprises a controller which is used for controlling the expansion and contraction of the heat insulating roller shutter and the opening and closing of an electric blanket.
As a further improvement of the assembly type covering and heat insulating device for the large-volume concrete of the pier, the control system is electrically connected with a temperature measuring system, and the temperature measuring system comprises:
the environment temperature sensor is arranged at a measuring point for measuring the environment temperature;
and the concrete outer wall temperature sensor is arranged at a measuring point for measuring the temperature of the concrete outer wall.
Aiming at the use method of the assembly type covering and heat insulating device for the large-volume concrete of the pier, the invention specifically comprises the following steps:
s1: when large-volume concrete is poured, the internal and external temperature difference of the concrete is obtained;
s2: comparing the temperature difference with a first preset value, and when the temperature difference is not greater than the first preset value, performing S3;
s3: the thermal insulation roller shutter is extended to cover the outer wall of the concrete.
As a further improvement of the method of use of the present invention, in S2:
if the temperature difference is greater than the first preset value, comparing the temperature difference with a second preset value, and if the temperature difference exceeds the second preset value and does not exceed a third preset value, performing S4;
if the temperature difference is greater than the third preset value, performing S5;
if the temperature difference between the heat-preservation roller shutter and the outer wall surface of the concrete exceeds a second preset value, S6 is carried out;
s4: opening an electric blanket on the heat-preservation roller shutter to heat and preserve heat as a first-grade heat preservation;
s5: continuously raising the temperature of the electric blanket, and heating and preserving heat to be used as second-level heat preservation;
s6: immediately stopping heating the electric blanket.
As a further improvement of the method of use of the present invention, S7: maintaining the temperature until the temperature control index meets the requirement of removing the mold, and removing the mold at the time when the corresponding temperature condition is met;
s8: and during mould stripping, if the measured temperature difference between the inside and the outside of the concrete exceeds a second preset value, mounting the heat-insulating roller shutter on the concrete after mould stripping, and heating and insulating.
As a further improvement of the use method of the invention, if the temperature difference between the inside and the outside of the concrete exceeds a third preset value, the heating is stopped.
As a further improvement of the using method of the invention, the specific steps of calculating the heating time of the heat-preservation roller shutter are as follows:
a1: heat transfer transferred per unit time:
Φ＝K*S*(thot air-tSurface 1)···········(1)
K-convective heat transfer coefficient;
area of S-heat transfer
tHot airIs the air temperature, tSurface 1Is the initial surface temperature of the concrete;
heating cement to absorb heat:
Q＝cconcrete and its production methodmConcrete and its production method(tSurface 2-tSurface 1)···········(2)
cConcrete and its production methodIs the specific heat capacity, m, of concreteConcrete and its production methodIs the mass of the concrete, tSurface 2The final surface temperature of the concrete;
let Φ Δ t be Q
That is, the expression (1) is multiplied by Δ t at both sides, and is combined with the expression (2) to obtain:
K·S·(thot air-tSurface 1)△t＝cConcrete and its production method·mConcrete and its production method·(tSurface 2-tSurface 1)
Delta t is the time of the concrete surface temperature change;
then
Then
T is the instantaneous temperature change of the concrete;
then: K.S. (t)Hot air-tSurface 1)＝cConcrete and its production methodmConcrete and its production method·T；
A function is constructed
A and b are coefficients, e is a natural constant, d is a constant, and x is the time of temperature change;
substituting the measured data to calculate to obtain the coefficients A and b.
The invention has the advantages and beneficial effects that:
the invention provides an assembly type covering and heat-insulating device for mass concrete, which comprises a positioning device, a heat-insulating heating roller shutter, a temperature measuring system and a control system; the heating and heat-preserving roller shutter is formed by modifying the traditional maintenance device. Based on the principle of internal drop and external protection, the heating wire is arranged in the roller shutter, and the control system is used for heating, so that the heat exchange is generated between the outer surface of the mass concrete structure and the heat-preservation roller shutter, and the internal and external temperature difference of the mass concrete structure is reduced.
The temperature measuring system designed by the invention can measure the temperature of the environment and the surface of the concrete, can determine whether the heat preservation and the heating mode adjustment are needed to be covered according to the temperature data, effectively controls the temperature difference inside and outside the mass concrete, and achieves the purpose of reducing the temperature-induced cracks on the surface of the structure.
According to the invention, a heating time temperature formula is derived through strict heat exchange calculation according to factors such as concrete, electric heating wires and temperature, and the heat preservation control is realized through an operating system, so that the temperature control is accurate.
Drawings
Fig. 1 is an elevation view (one side) of the thermal insulating rolling shutter.
Fig. 2 is a detail view of the structure of the heat preservation roller shutter.
Fig. 3 is a schematic view of the movable lock and the buckle.
Fig. 4 is a specific connection diagram (two side surfaces) of the thermal insulation roller shutter.
Reference numerals: 1. a cross beam; 2. a thermal insulation roller shutter; 21. an aluminum alloy; 22. a waterproof plastic film; 23. an electric blanket; 3. a positioning device; 31. hanging and buckling; 32. a retaining ring; 4. a control system; 5. a temperature measuring system; 51. an ambient temperature sensor; 52. a concrete outer wall temperature sensor; 6. an elastic rope.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in figure 1, the assembly type covering and heat insulating device for the large-volume concrete of the pier comprises a cross beam positioning device, a heat insulating roller shutter, a temperature measuring system and a control system. The heat preservation device can be assembled and disassembled and is used for covering and preserving the large-volume concrete of the bridge pier.
The positioning device of the assembly type covering and heat insulating device suitable for the large-volume concrete of the bridge pier is a device comprising four cross beams, a plurality of hanging buckles and retaining rings. Each beam is fixed on a side template retaining ring through a hanging buckle, and a cavity is formed inside each beam and used for storing the heat-preservation roller shutter; the middle of the bottom of the template is provided with a retaining ring so as to facilitate the connection of the hanging buckle of the heat-preservation roller shutter. The assembled covering and heat-insulating device suitable for the large-volume concrete of the bridge pier is characterized in that the heat-insulating roller shutters are of a telescopic five-layer structure, and the inner layer and the outer layer are made of light aluminum alloy and are used as roller shutter lifting carriers; the middle part is an electric blanket made of waterproof cloth; a waterproof plastic film is arranged between the light aluminum alloy and the electric blanket. The electric blanket is provided with two heating levels to meet different heat preservation requirements.
According to the assembled covering and heat-insulating device suitable for the large-volume concrete of the bridge pier, the elastic ropes are transversely arranged on the outermost layer of the heat-insulating roller shutter at intervals of 0.5m in the height direction, the movable lock catches are arranged at the two ends of the heat-insulating roller shutter, and the length of the elastic ropes is as wide as that of the heat-insulating roller shutter in a loose state.
According to the assembly type covering and heat insulating device suitable for the large-volume concrete of the bridge pier, the temperature measuring system is provided with a plurality of sensors, and the ambient temperature (2 measuring points) is respectively measured; the concrete outer wall temperature (20 measuring points) is respectively arranged on four surfaces of the four-surface roller shutter.
The control system of the assembly type covering and heat insulating device suitable for the large-volume concrete for the bridge pier is mainly used for controlling the lifting of the roller shutter and the heating switch.
The assembly type covering and heat insulating device suitable for the large-volume concrete for the bridge pier comprises the following implementation steps:
(1) when the template is installed, positioning retaining rings are installed on the upper part and the lower part of the template;
(2) after the template is installed, connecting snap rings and movable lock catches at the top, the bottom and the side of the template so as to fix the cross beam and the heat-preservation roller shutter;
(3) pouring the large-volume concrete, and controlling the working state of the roller shutter according to the internal and external temperature difference monitored in real time;
(4) if the temperature difference between the inside and the outside is less than or equal to 20 ℃ and has a tendency of increasing and possibly exceeding 25 ℃, the roller shutter is put down for heat preservation;
(5) if the temperature difference between the inside and the outside exceeds 25 ℃ and tends to increase, and possibly exceeds 28 ℃, starting a first-grade heating system of the electric blanket;
(6) if the temperature difference between the inside and the outside exceeds 28 ℃ and tends to increase, and possibly exceeds 30 ℃, starting a second-gear heating system of the electric blanket;
(7) in the heating process, if the difference between the temperature of the roller shutter and the temperature of the surface of the concrete exceeds 25 ℃, the heating is stopped immediately;
(8) maintaining until the temperature control index meets the requirement of removing the mold, and removing the mold at the time when the atmospheric temperature is higher in the same day;
(9) if the form is removed when the temperature difference between the inside and the outside is large because of the construction period, the heat-preservation roller shutter is installed immediately after the form is removed. The specific method is that the windward side is firstly disassembled, and the covering is carried out while the disassembly is carried out;
(10) if the temperature difference between the inside and the outside exceeds 25 ℃ and tends to increase, and possibly exceeds 28 ℃, a first-gear or second-gear heating system of the electric blanket is started as appropriate; at any time, if the temperature difference between the inside and the outside exceeds 28 ℃, the mold can not be removed.
Calculation process
Thermal insulation rolling screen plane area S
The ambient temperature is 25 DEG C
The surface temperature of the heat-preservation roller shutter is 35 ℃/40 DEG C
The surface temperature of the concrete is 25 DEG C
Heat transfer transferred per unit time
Φ＝K*S*(tHot air-tSurface 1)J············(1)
K-convective heat transfer coefficient 50J/(m)2*s*℃)
Area of S-heat transfer
Cement temp. rising and heat absorption
Q＝cConcrete and its production methodmConcrete and its production method(tSurface 2-tSurface 1)J···········(2)
Let Φ Δ t be Q;
C＝2500J/kg℃
mconcrete and its production method＝S·0.05ρConcrete and its production method＝110S
ρConcrete and its production methodIs 2200kg/m3；
tSurface 2Is 30 ℃;
the temperature of the hot air between the roller shutter and the member is 30 ℃;
(1) the two sides of the formula are multiplied by delta t, and the formula (2) is combined to obtain
K·S·(30-tSurface 1)△t＝cConcrete and its production methodmConcrete and its production method(tSurface 2-tSurface 1)
T is the instantaneous temperature change of the concrete;
the carry-in parameter is 50 (30-t)Surface 1)＝275000T；
Get T ═ Ae-0.153x+30, when the initial condition x is 0, tSurface 1Resolving at 25 deg.C to obtain A-5;
a is a coefficient;
therefore, after the temperature is reduced for x hours, the instantaneous temperature change of the concrete is as follows:
T＝-5e-0.153x+30
when the concrete is subjected to second-level heat preservation and the temperature begins to be reduced for x hours, the instantaneous temperature variation of the concrete is as follows:
T＝-8e-0.245x+33
first-grade insulation time table (Unit:. degree. C.)
Second-grade Heat preservation time table (Unit:. degree. C.)
The positioning device is the cross beam 1 and the positioning device 3 thereof. Four beams 1 are hung on side formwork retaining rings 32 through hanging buckles 31, and the interiors of the beams 1 are cavities for storing the heat-preservation roller shutters 2.
The heat-insulating roller shutter 2 is of a telescopic multilayer structure, the outer layer is light aluminum alloy 21 and is a roller shutter lifting carrier; the middle layer is an electric blanket 23, the outer layer is made of waterproof nylon cloth, and a waterproof plastic film 22 is arranged between the aluminum alloy 21 and the electric blanket 23.
Elastic ropes 6 are arranged in the outer layer aluminum alloy 21 of the heat-preservation roller shutter 2 every 0.5m, the length of the elastic ropes is as wide as that of the roller shutter in a loose state, and hanging buckles 31 are arranged at two ends of the elastic ropes.
The temperature measuring system is composed of a plurality of sensors 5, and an ambient temperature sensor 51(2 measuring points) for respectively measuring the ambient temperature; the concrete outer wall temperature sensor 52(28 measuring points) for measuring the temperature of the concrete outer wall has the same arrangement mode of the four walls.
The control system 4 is mainly used for controlling the roller shutters, the lifting and the opening and closing of the electric blanket.
The invention has the advantages and beneficial effects that:
1. the invention provides an assembly type covering and heat-insulating device for mass concrete, which comprises a positioning device, a heat-insulating heating roller shutter, a temperature measuring system and a control system; the heating and heat-preserving roller shutter is formed by modifying the traditional maintenance device. Based on the principle of internal drop and external protection, the heating wire is arranged in the roller shutter, and the control system is used for heating, so that the heat exchange is generated between the outer surface of the mass concrete structure and the heat-preservation roller shutter, and the internal and external temperature difference of the mass concrete structure is reduced.
2. The temperature measuring system designed by the invention can measure the temperature of the environment and the surface of the concrete, can determine whether the heat preservation and the heating mode adjustment are needed to be covered according to the temperature data, effectively controls the temperature difference inside and outside the mass concrete, and achieves the purpose of reducing the temperature-induced cracks on the surface of the structure.
3. According to the invention, a heating time temperature formula is derived through strict heat exchange calculation according to factors such as concrete, electric heating wires and temperature, and the heat preservation control is realized through an operating system, so that the temperature control is accurate.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides an assembled cover heat preservation device for pier bulky concrete which characterized in that includes:
a cross beam (1) horizontally connected to the upper part of the concrete side formwork;
and the heat-insulating roller shutters (2) are axially arranged along the cross beams (1) and can telescopically cover the concrete side formwork.
2. The fabricated covering and insulating device for large-volume concrete for piers according to claim 1, wherein:
the inner part of the beam (1) is of a cavity structure and accommodates the telescopic heat-insulation roller shutter (2);
the thermal insulation roller shutter (2) comprises:
the aluminum alloy (21) is used as a lifting carrier of the heat-preservation roller shutter (2) and is positioned on the inner surface layer and the outer surface layer of the heat-preservation roller shutter (2);
the electric blanket (23) is positioned between the aluminum alloys (23) on the inner surface layer and the outer surface layer and is used as the middle layer of the heat-preservation roller shutter (2);
and the waterproof plastic film (22) is positioned between the aluminum alloy (21) and the electric blanket (23).
3. The fabricated covering and insulating device for large-volume concrete for piers according to claim 2, wherein: a plurality of horizontal elastic ropes (6) are arranged in the aluminum alloy (23) close to the concrete side formwork at intervals, hanging buckles (31) are arranged at the end parts of the elastic ropes (6), and the adjacent heat-preservation roller shutters (2) are connected through the hanging buckles (31) at the end parts of the elastic ropes (6) in a buckling mode;
the bottom of the aluminum alloy (23) close to the concrete side formwork is also provided with a hanging buckle (31), the bottom of the concrete side formwork is provided with a corresponding retaining ring (32), and the hanging buckle (31) at the bottom of the aluminum alloy (23) can be connected with the retaining ring (32) at the bottom of the concrete side formwork in a buckling manner;
crossbeam (1) passes through positioner (3) to be connected on concrete side template upper portion, positioner (3) include:
the hanging buckle (31) is connected to the cross beam (1);
and the retaining ring (32) is connected to the upper part of the concrete side formwork and is connected with the hanging buckle (31) in a buckling manner.
4. The assembly type covering and heat insulating device for the large-volume concrete of the pier is characterized in that the heat insulating roller shutters (2) are electrically connected with a control system (4), and the control system (4) comprises a controller which is used for controlling the expansion and contraction of the heat insulating roller shutters (2) and the opening and closing of an electric blanket.
5. The fabricated covering and insulating device for pier mass concrete according to claim 4, characterized in that the control system (4) is electrically connected with a temperature measuring system (5), and the temperature measuring system (5) comprises:
an ambient temperature sensor (51) disposed at a measurement point for measuring ambient temperature;
and the concrete outer wall temperature sensor (52) is arranged at a measuring point for measuring the temperature of the concrete outer wall.
6. The use method of the assembly type covering and heat insulating device for the large-volume concrete of the pier according to claim 1, which comprises the following steps:
s1: when large-volume concrete is poured, the internal and external temperature difference of the concrete is obtained;
s2: comparing the temperature difference with a first preset value, and when the temperature difference is not greater than the first preset value, performing S3;
s3: the heat-insulating roller shutter (2) is extended to cover the outer wall of the concrete.
7. The use of the fabricated sheathing heat-preserving device for pier mass concrete according to claim 6, wherein in S2:
if the temperature difference is greater than the first preset value, comparing the temperature difference with a second preset value, and if the temperature difference exceeds the second preset value and does not exceed a third preset value, performing S4;
if the temperature difference is greater than the third preset value, performing S5;
if the temperature difference between the temperature of the heat-insulating roller shutter (2) and the surface temperature of the outer wall of the concrete exceeds a second preset value, S6 is carried out;
s4: an electric blanket (23) on the heat preservation roller shutter (2) is started to heat and preserve heat as a first-grade heat preservation;
s5: continuously raising the temperature of the electric blanket (23), and heating and preserving heat as second-level heat preservation;
s6: immediately stopping heating the electric blanket (23).
8. The use method of the fabricated covering and insulating device for pier mass concrete according to claim 7, wherein the fabricated covering and insulating device comprises:
s7: maintaining the temperature until the temperature control index meets the requirement of removing the mold, and removing the mold at the time when the corresponding temperature condition is met;
s8: and during the mould stripping, if the measured temperature difference between the inside and the outside of the concrete exceeds a second preset value, the heat-insulating roller shutter (2) is installed on the concrete after the mould stripping, and the heating and heat insulation are carried out.
9. The use method of the fabricated covering and insulating device for pier mass concrete according to claim 8, wherein the fabricated covering and insulating device comprises:
and if the temperature difference between the inside and the outside of the concrete exceeds a third preset value, stopping heating.
10. The use method of the fabricated covering and insulating device for pier mass concrete according to claim 6 or 7, characterized in that the heating time of the insulating roller shutter (2) is calculated by the following steps:
heat transfer transferred per unit time:
Φ＝K*S*(thot air-tSurface 1)···········(1)
K-convective heat transfer coefficient;
area of S-heat transfer
tHot airIs the air temperature, tSurface 1Is the initial surface temperature of the concrete;
heating cement to absorb heat:
Q＝cconcrete and its production methodmConcrete and its production method(tSurface 2-tSurface 1)···········(2)
cConcrete and its production methodIs the specific heat capacity, m, of concreteConcrete and its production methodIs the mass of the concrete, tSurface 2The final surface temperature of the concrete;
let Φ Δ t be Q
That is, the expression (1) is multiplied by Δ t at both sides, and is combined with the expression (2) to obtain:
K·S·(thot air-tSurface 1)△t＝cConcrete and its production method·mConcrete and its production method·(tSurface 2-tSurface 1)
Delta t is the time of the concrete surface temperature change;
then
Then
T is the instantaneous temperature change of the concrete;
then: K.S. (t)Hot air-tSurface 1)＝cConcrete and its production methodmConcrete and its production method·T；
A function T ═ Ae is constructedbx+ d, then A, b are coefficients, e is a natural constant, d is a constant, x is the time of temperature change;
substituting the measured data to calculate to obtain the coefficients A and b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111208333.XA CN113956071B (en) | 2021-10-18 | 2021-10-18 | Assembled covering and heat-insulating device for large-volume concrete of bridge pier and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111208333.XA CN113956071B (en) | 2021-10-18 | 2021-10-18 | Assembled covering and heat-insulating device for large-volume concrete of bridge pier and using method |
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| CN115182604A (en) * | 2022-07-29 | 2022-10-14 | 中建西部建设北方有限公司 | Mass concrete curing method, device and medium |
| CN115500184A (en) * | 2022-09-01 | 2022-12-23 | 中国一冶集团有限公司 | Maintenance cover device suitable for vase mound |
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| CN115500184A (en) * | 2022-09-01 | 2022-12-23 | 中国一冶集团有限公司 | Maintenance cover device suitable for vase mound |
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| CN113956071B (en) | 2022-08-23 |
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