CN109664400B - Concrete heating and humidifying strength maintenance device and method for steel platform bracket placement position - Google Patents
Concrete heating and humidifying strength maintenance device and method for steel platform bracket placement position Download PDFInfo
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- CN109664400B CN109664400B CN201811630647.7A CN201811630647A CN109664400B CN 109664400 B CN109664400 B CN 109664400B CN 201811630647 A CN201811630647 A CN 201811630647A CN 109664400 B CN109664400 B CN 109664400B
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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
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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
- B28B11/247—Controlling the humidity during curing, setting or hardening
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Abstract
The invention discloses a concrete heating and humidifying strength maintenance device at a steel platform bracket laying position, and relates to the technical field of super high-rise building construction. The method aims to solve the problems that the existing maintenance method for the placement position of the steel platform bracket is high in construction difficulty, easy to generate temperature cracks and incapable of detecting the strength of concrete. It includes: the strength detection device is arranged on the horizontal plane of the opening at the position where the steel platform bracket is placed, and is used for measuring the wave velocity of the concrete and calculating to obtain the strength of the concrete; the heating temperature control device is vertically arranged on the side surface of the core cylinder wall body, covers the wall body at the periphery of the hole and is used for heating the wall body concrete at the periphery of the hole; the humidifying and humidity-controlling device is arranged in a hole at the position where the bracket of the steel platform is placed and used for adjusting the air humidity; at least one temperature and humidity sensor is arranged in a hole at the position where the steel platform bracket is placed, and at least one temperature and humidity sensor is arranged in the concrete wall body; and the control and calculation center is respectively in signal connection with the heating temperature control device, the humidification temperature control device and the plurality of temperature and humidity sensors.
Description
Technical Field
The invention relates to the technical field of super high-rise building construction, in particular to a device and a method for maintaining the heating and humidifying strength of concrete at a bracket placing position of a steel platform.
Background
With the development of society, the construction technology of the super high-rise formwork gradually develops from an initial slip form to an integral steel platform formwork with higher construction speed, better safety and better integrity, and the integral steel platform formwork becomes one of the most important construction tools in the modern super high-rise building.
The whole steel platform formwork is large in self load and needs to bear certain construction load in the aspects of materials, personnel, machinery and the like, so that the steel platform bracket placing part needing the core barrel can provide large bearing capacity, and especially under the condition that the load of a steel platform system is integrally improved and the construction progress is accelerated, higher requirements are provided for the bearing capacity of the steel platform bracket placing part. In the super high-rise building work progress, the steel form can play certain guard action in early stage, but after the form removal, the concrete direct exposure in the air, external environment's temperature and humidity condition direct influence concrete pour the quality, when the temperature is lower, produce the difference in temperature crack easily, when humidity is lower, produce the humidity diffusion more easily, inside moisture loss produces drying shrinkage, arouses the crack.
The defects of the traditional maintenance method for the steel platform bracket laying position are embodied as follows:
(1) the traditional way of curing the concrete surface by heating the template is adopted, on one hand, the temperature of the concrete surface is not easy to control, and on the other hand, the template is troublesome to operate and is not beneficial to construction; meanwhile, in the early age stage of the concrete, the temperature inside the concrete can be increased due to the heat release of the hydration reaction of the concrete, so that the temperature is not increased synchronously due to the simple heating outside the concrete, the temperature difference is generated, and the temperature crack is easy to generate;
(2) the method for heating the internal reinforcing steel bars is adopted to improve the strength of the concrete, on one hand, large-area concrete can be heated, the consumed energy is large, meanwhile, the reinforcing steel bars around the position where the steel platform bracket is placed are heated, the operation is troublesome, and the construction difficulty in actual engineering is large;
(3) when dry weather conditions occur, the external environment humidity is low, the humidity inside the concrete is high, so that the condition that the concrete moisture is diffused to the outside is easy to occur, particularly at the position where a steel platform bracket is placed, the moisture escape phenomenon at the position is serious due to the fact that the contact area between the concrete and the outside is large and the inside is in direct contact with the outside, when the internal relative humidity is reduced quickly, not only is the cement hydration influenced and the self-drying phenomenon generated, but also the moisture in the internal pores is quickly reduced, the pressure of microscopic pores is increased, the drying shrinkage is easy to generate, and cracks are generated;
(4) because the place where the steel platform bracket is placed is embedded into the concrete wall of the core barrel, the traditional rebound method for detecting the concrete strength cannot be applied, and the resiliometer cannot detect the concrete strength of the surface where the steel platform bracket is placed.
Disclosure of Invention
The method aims to solve the problems that the traditional maintenance method for the placement position of the steel platform bracket is high in construction difficulty, easy to generate temperature cracks and incapable of detecting the concrete strength of the surface of the placement position of the steel platform bracket. The invention aims to provide a device and a method for maintaining the heating and humidifying strength of concrete at the position where a steel platform bracket is placed, which are used for heating and/or humidifying the concrete at the position where the steel platform bracket is placed in a targeted manner, so that the concrete strength of the position where the steel platform bracket is placed is improved, the concrete can be prevented from shrinking and cracking, and the concrete pouring quality of the position where the steel platform bracket is placed is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: concrete heating humidification intensity curing means of department is shelved to steel platform bracket, it includes:
the strength detection device is arranged on the horizontal plane of the hole at the position where the steel platform bracket is placed, and the real-time concrete strength at the position where the steel platform bracket is placed is calculated through the internal wave velocity of the concrete measured by the strength detection device;
the heating temperature control device is vertically arranged on the side surface of the core cylinder wall body, covers the peripheral wall body of the opening of the steel platform bracket placing position and is used for heating the concrete of the peripheral wall body of the opening of the steel platform bracket placing position;
the humidifying and humidity-controlling device is arranged in a hole at the position where the steel platform bracket is placed and used for adjusting the air humidity around the position where the steel platform bracket is placed;
the temperature and humidity sensors are arranged in the opening of the steel platform bracket placing position, and at least one temperature and humidity sensor is arranged in the concrete wall body close to the steel platform bracket placing position;
the control calculation center is arranged in the opening of the steel platform bracket placement part and is respectively in signal connection with the heating temperature control device, the humidifying and humidity control device and the temperature and humidity sensors, and the control calculation center is used for judging whether the real-time concrete strength of the steel platform bracket placement part reaches a target value or not and controlling the heating temperature control device and the humidifying and humidity control device to heat and/or humidify the concrete of the wall body around the opening of the steel platform bracket placement part until the real-time concrete strength of the steel platform bracket placement part reaches the target value.
Preferably, the intensity detecting device includes: the ultrasonic intensity detector is arranged on the horizontal plane of the opening at the position where the steel platform bracket is placed, the transmitting transducer is arranged on the horizontal plane of the opening at the position where the steel platform bracket is placed, the receiving transducer is arranged on the outer wall surface of the position where the steel platform bracket is placed, and the transmitting transducer and the receiving transducer are respectively connected with the ultrasonic intensity detector.
Preferably, the heating temperature control device comprises:
the heat conduction layer is attached to and fixed on the outer side wall surface of the place where the steel platform bracket is placed, and the heat conduction layer is provided with reserved holes corresponding to the holes at the place where the steel platform bracket is placed;
the heating layer is laid on the surface of the heat-conducting layer;
the heat insulation layer is arranged on the outer sides of the heat conduction layer and the heating layer;
and the heater is connected with the heating layer and is in signal connection with the control calculation center.
Preferably, the heat conducting layer is made of an aluminum plate, the heating layer is formed by laying multiple groups of heating cables connected in series on the surface of the heat conducting layer, and the heat insulating layer is made of a non-heat-conducting material.
Preferably, the humidification and humidity control device at least comprises: ultrasonic humidifier and water box, ultrasonic humidifier with control calculation center signal connection, wherein, ultrasonic humidifier includes atomizer and fan at least, the ultrasonic wave high frequency oscillation that the atomizer sent will water in the water box atomizes, through control the size of fan amount of wind and the size of atomizing speed control humidity.
Preferably, the device also comprises a shell body matched with the hole at the position where the steel platform bracket is placed, the shell body is composed of a top plate and three side plates connected with the top plate, the strength detection device, the humidification and humidity control device and the control and calculation center are fixed in the shell body, and the shell body is connected with the hole at the position where the steel platform bracket is placed through bolts.
The invention also provides a concrete heating and humidifying strength maintenance method for the steel platform bracket laying position, which comprises the following steps:
s1: carrying out calibration test on the concrete strength measured by an ultrasonic instrument, measuring the wave velocity of the concrete member in the curing process, establishing a relational expression of the wave velocity and the concrete strength, and establishing a concrete strength development curve;
s2: in the concrete pouring process of the steel platform bracket laying position, at least one temperature and humidity sensor is pre-buried in concrete, after the concrete pouring is finished, a concrete heating and humidifying strength maintenance device of the steel platform bracket laying position is installed at the steel platform bracket laying position, at least one temperature and humidity sensor is arranged in a hole in the steel platform bracket laying position, the wave velocities v1 and v2 … vi in the concrete maintenance process of the steel platform bracket laying position are measured through a strength detection device at intervals of a time period, the concrete strengths f1 and f2 … fi corresponding to the wave velocities v1 and v2 … vi are calculated by using the relational expression between the wave velocities and the concrete strength obtained in the step S1, and whether the real-time concrete strength of the steel platform bracket laying position reaches the concrete strength target value corresponding to the concrete strength development curve in the step S1 is judged;
s3: and controlling the heating temperature control device to heat or cool and/or controlling the humidifying humidity control device to humidify by using the control and calculation center, so that the real-time concrete strength at the position where the steel platform bracket is placed reaches the target value of the concrete strength corresponding to the concrete strength development curve in the step S1.
Preferably, in step S1, in a calibration test for measuring the concrete strength by using an ultrasonic instrument, the internal wave velocity of the concrete member is measured for 1 to 7 days; in the step S2, the required strength of the steel platform corbel rest is calculated according to the design of the whole steel platform formwork, the concrete strength development curve of the steel platform corbel rest in 1-5 days is calculated, then the steel platform corbel rest is divided into a plurality of time periods, each time period is 2-3 hours, and the wave velocity v1 and v2 … vi in the concrete curing process of the steel platform corbel rest in each time period is measured.
Preferably, in the step S1, the wave velocity v of the concrete and the concrete strength fcThe relationship of (1) is derived as follows:
s11: calculating the concrete wave velocity v according to the relation between the concrete wave velocity and time and the relation between the concrete wave velocity and distance measurement;
the relationship between the concrete wave speed and the time is as follows:
wherein v is the concrete wave velocity (km/s);
liranging (mm) for ultrasonic instruments;
tithe sound time reading (mu s) of the ultrasonic wave at the current moment;
t0initial sound time readings (mus) of the ultrasonic waves;
the relation between the concrete wave speed and the distance measurement is as follows:
wherein liRanging (mm) for ultrasonic instruments;
l1i、l2idistance (mm) between the ultrasonic instrument and the edge of the concrete member;
s12: calculating the elastic modulus E of the concrete according to the relation between the wave velocity and the elastic modulus of the concrete;
wherein v is the concrete wave velocity (km/S) obtained in the step S11;
mu is the Poisson's ratio of the concrete;
rho is the density of concrete, and both mu and rho can be obtained by measuring through a commercially available instrument;
s13: obtaining the concrete strength f according to the relation between the elastic modulus and the concrete strengthc；
Wherein f iscThe concrete strength is adopted;
e is the elastic modulus calculated in step S12.
The invention also provides a concrete heating and humidifying strength maintenance method for the steel platform bracket laying position, which comprises the following steps:
s1: carrying out calibration test on the concrete strength measured by an ultrasonic instrument, measuring the wave velocity of the concrete member in the curing process, establishing a relational expression of the wave velocity and the concrete strength, and establishing a concrete strength development curve;
s2: the method comprises the following steps that in the concrete pouring process of a steel platform bracket laying position, at least one temperature and humidity sensor is pre-buried in concrete, after the concrete pouring is finished, a concrete heating and humidifying strength curing device of the steel platform bracket laying position is installed at the steel platform bracket laying position, and at least one temperature and humidity sensor is arranged in a hole of the steel platform bracket laying position; measuring the temperature and humidity outside the concrete by a temperature and humidity sensor arranged in a cave at the position where the steel platform bracket is placed, and obtaining the concrete strength by utilizing a maturity formula; and/or measuring the temperature and humidity inside the concrete through a temperature and humidity sensor arranged in the concrete wall body close to the position where the steel platform bracket is placed, and obtaining the concrete strength by utilizing a hydration degree formula; judging whether the real-time concrete strength at the position where the steel platform bracket is placed reaches a target value of concrete strength corresponding to the concrete strength development curve in the step S1;
s3: and controlling the heating temperature control device to heat or cool and/or controlling the humidifying humidity control device to humidify by using the control and calculation center, so that the real-time concrete strength at the position where the steel platform bracket is placed reaches the target value of the concrete strength corresponding to the concrete strength development curve in the step S1.
Preferably, in the step S2, the temperature and humidity outside the concrete are measured by the temperature and humidity sensor disposed in the opening of the steel platform bracket, and the concrete strength f is obtained by using a maturity formula, i.e., a relational expression between the external temperature and humidity of the concrete and the concrete strengthc；
The relationship between the external temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein, t0The starting time for the development of concrete strength;
tethe current moment of concrete strength development;
fcfor the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete is data directly provided by commercial concrete;
kTmodel parameters (rate constants) that take into account the effects of curing temperature and curing humidity;
the above model parameter kTThe relationship with temperature and humidity is as follows:
kT＝A(h)×e(BT)
wherein k isTModel parameters (rate constants) that take into account the effects of curing temperature and curing humidity;
a (h) is a parameter considering the humidity of maintenance, and h is the current time teThe external humidity of the concrete at the place where the steel platform bracket is placed;
b is a constant;
t is the current time TeThe external temperature of the concrete where the steel platform corbels are placed.
Preferably, in the step S2, the temperature and humidity inside the concrete are measured by the temperature and humidity sensor disposed inside the concrete wall at the position where the steel platform bracket is placed, and the concrete strength f is obtained by using the hydration degree formula, i.e., the relational expression between the temperature and humidity inside the concrete and the concrete strengthc；
The relation between the internal temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein f isc(α) is the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete;
α(te) For the current time teThe degree of concrete hydration of;
α0the initial hydration degree of the concrete;
αuthe final hydration degree of the concrete;
a is a constant;
the current time teConcrete hydration degree of α (t)e) And temperature and humidity as follows:
α (t) among theme) For the current time teThe degree of concrete hydration of;
αecthe hydration degree is the hydration degree when the relative humidity in the concrete begins to decrease;
tecthe equivalent age when the relative humidity in the concrete begins to decline;
RH is the current time teThe relative humidity inside the concrete;
k, p are constants;
n is the nominal reaction order.
The invention has the following effects:
the invention relates to a concrete heating and humidifying strength maintenance device at a steel platform bracket laying position, which comprises a strength detection device, a heating temperature control device, a humidifying and humidity control device and a control calculation center, wherein the strength detection device, the heating temperature control device, the humidifying and humidity control device and the control calculation center are arranged at a hole at the steel platform bracket laying position, wherein the control and calculation center is respectively connected with the heating temperature control device, the humidifying temperature control device and a plurality of temperature and humidity sensors through signals, the internal wave velocity of the concrete is measured by the strength detection device and the real-time concrete strength at the position where the bracket of the steel platform is placed is calculated, or the real-time concrete strength of the steel platform bracket laying part is calculated by the hygrothermograph inside and outside the concrete, the control calculation center judges whether the real-time concrete strength of the steel platform bracket laying part reaches a target value, controlling the heating temperature control device and the humidifying humidity control device to heat and/or humidify the concrete at the position where the steel platform bracket is placed until the real-time concrete strength at the position where the steel platform bracket is placed reaches a target value; by heating and/or humidifying the concrete at the position where the steel platform bracket is placed in a targeted manner, the concrete strength at the position where the steel platform bracket is placed is improved, the concrete can be prevented from shrinking and cracking, the concrete pouring quality at the position where the steel platform bracket is placed is ensured, and therefore the preset bearing capacity at the position where the steel platform bracket is placed is achieved under the conditions that the overall load of the overall steel platform formwork is improved and the construction progress is advanced; moreover, the automatic control of concrete curing at the position where the steel platform bracket is placed is realized through the control and calculation center, the operation is flexible and convenient, the construction safety is high, and the working efficiency is improved.
The invention relates to a concrete heating and humidifying strength maintenance method at the position where a bracket of a steel platform is placed, which comprises the steps of firstly, carrying out a calibration test on the strength of concrete measured by ultrasonic waves, and establishing a relational expression of wave velocity and the strength of the concrete and a concrete strength development curve; after concrete pouring at the position where the steel platform bracket is placed is finished and a concrete heating and humidifying strength maintenance device at the position where the steel platform bracket is placed is installed, the wave velocity of the concrete is measured at intervals, corresponding concrete strength is calculated through a relational expression of the wave velocity and the concrete strength, a control calculation center judges whether the real-time concrete strength reaches a concrete strength target value corresponding to a concrete strength development curve or not, heating or cooling of a heating temperature control device is controlled, and/or humidification of a humidifying and humidity control device is controlled to enable the real-time concrete strength to reach the concrete strength target value corresponding to the concrete strength development curve, the concrete heating and humidifying strength maintenance method at the position where the steel platform bracket is placed improves the concrete strength at the position where the steel platform bracket is placed, and can prevent shrinkage and cracks of the concrete, the concrete pouring quality of the place where the steel platform bracket is placed is guaranteed, and therefore the place where the steel platform bracket is placed can reach the preset bearing capacity under the conditions that the overall load of the overall steel platform formwork is improved and the construction progress is advanced.
Drawings
FIG. 1 is a schematic view of a bracket place of a steel platform reserved on the side surface of a core tube wall according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a concrete heating and humidifying strength maintenance device installed at a steel platform bracket shelf according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a strength detection device in the concrete heating and humidifying strength maintenance device at the position where the bracket of the steel platform is placed according to an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a heating temperature control device in the concrete heating and humidifying strength curing device at the position where the bracket of the steel platform is placed according to one embodiment of the invention;
FIG. 5 is a schematic view of a heating temperature control device installed outside a steel platform corbel resting place in a concrete heating and humidifying strength maintenance device of the steel platform corbel resting place according to an embodiment of the invention;
FIG. 6 is a schematic structural view of a humidifying and humidity-controlling device in a concrete heating humidifying strength curing device at the position where a bracket of a steel platform is placed according to an embodiment of the invention;
fig. 7 is a side view of fig. 6.
The numbers in the figures are as follows:
a core tube wall 1; a steel platform bracket placing part 2; embedding a bolt 3; a steel molding plate 4;
an intensity detection device 10; an ultrasonic intensity detector 11; a transmitting transducer 12; a receiving transducer 14;
heating the temperature control device 20; a heat conductive layer 21; a heat generating layer 22;
a humidification and humidity control device 30; an atomizer 31; a water box 32; a fan 33;
a temperature and humidity sensor 40; controls the computing center 50.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
The first embodiment is as follows: the concrete heating and humidifying strength maintenance device for the bracket rest of the steel platform is described by combining the figures 1 to 7, and comprises:
the strength detection device 10 is arranged on the horizontal plane of the hole of the steel platform bracket placing part 2, and the real-time concrete strength of the steel platform bracket placing part 2 is calculated by measuring the wave velocity inside the concrete through the strength detection device 10;
the heating temperature control device 20 is vertically arranged on the side surface of the core tube wall 1, covers the wall body around the opening 2 of the steel platform bracket placing part and is used for heating the concrete of the wall body around the opening 2 of the steel platform bracket placing part;
the humidifying and humidity-controlling device 30 is arranged in a hole of the steel platform bracket placing part 2 and is used for adjusting the air humidity around the steel platform bracket placing part 2;
the temperature and humidity sensors 40 are arranged, wherein at least one temperature and humidity sensor 40 is arranged in the opening of the steel platform bracket placing part 2, and at least one temperature and humidity sensor 40 is arranged in the concrete wall body close to the steel platform bracket placing part 2;
the control calculation center 50 is arranged in the opening of the steel platform bracket placing part 2 and is respectively in signal connection with the heating temperature control device 20, the humidifying and humidity control device 30 and the temperature and humidity sensors 40, and the control calculation center 50 is used for judging whether the real-time concrete strength of the steel platform bracket placing part 2 reaches a target value or not and controlling the heating temperature control device 20 and the humidifying and humidity control device 30 to heat and/or humidify the concrete of the wall body around the opening of the steel platform bracket placing part 2 until the real-time concrete strength of the steel platform bracket placing part 2 reaches the target value.
The invention relates to a concrete heating and humidifying strength maintenance device at a steel platform bracket laying position, which comprises a strength detection device 10, a heating temperature control device 20, a humidifying and humidity control device 30 and a control and calculation center 50 which are arranged at a hole 2 of the steel platform bracket laying position, wherein the control and calculation center 50 is respectively in signal connection with the heating temperature control device 20, the humidifying and humidity control device 30 and a plurality of temperature and humidity sensors 40, the internal wave speed of concrete is measured by the strength detection device 10 and the real-time concrete strength of the steel platform bracket laying position 2 is calculated, or the real-time concrete strength of the steel platform bracket laying position 2 is calculated by temperature and humidity inside and outside the concrete, the control and calculation center 50 judges whether the real-time concrete strength of the steel platform bracket laying position 2 reaches a target value or not, and controls the heating temperature control device 20 and the humidifying and humidity control device 30 to heat and/or humidify the concrete at the steel platform bracket laying position 2, until the real-time concrete strength of the steel platform bracket placing part 2 reaches a target value; by heating and/or humidifying the concrete at the steel platform bracket laying part 2 in a targeted manner, the concrete strength of the steel platform bracket laying part 2 is improved, shrinkage and cracks of the concrete can be prevented, and the concrete pouring quality of the steel platform bracket laying part 2 is ensured, so that the steel platform bracket laying part 2 reaches a preset bearing capacity under the conditions of integral load improvement and construction progress advance of an integral steel platform formwork; moreover, the automatic control of concrete curing at the steel platform bracket laying position 2 is realized through the control and calculation center 50, the operation is flexible and convenient, the construction safety is high, and the working efficiency is improved.
As shown in fig. 3, the intensity detection device 10 includes: the ultrasonic strength detector is arranged on the horizontal plane of the 2 holes in the place where the steel platform bracket is placed, the transmitting transducer 12 is arranged on the horizontal plane of the 2 holes in the place where the steel platform bracket is placed, the receiving transducer 14 is arranged on the wall surface outside the place where the steel platform bracket is placed 2, and the transmitting transducer 12 and the receiving transducer 14 are respectively connected with the ultrasonic strength detector. The internal wave velocity of the concrete is measured through the ultrasonic strength detector, the real-time concrete strength of the surface of the steel platform bracket placing part 2 is obtained through the relational expression of the wave velocity and the concrete strength, the operation is convenient and fast, the accuracy is high, and the problem that the resiliometer cannot detect the strength of the surface of the steel platform bracket placing part 2 is solved.
As shown in fig. 2, 4 and 5, the heating temperature control device 20 includes: the heat conduction layer 21 is attached to and fixed on the outer side wall surface of the steel platform bracket placing part 2, and the heat conduction layer 21 is provided with reserved holes corresponding to the holes of the steel platform bracket placing part 2; a heat generating layer 22 laid on the surface of the heat conductive layer 21; a heat insulating layer provided outside the heat conductive layer 21 and the heat generating layer 22; a heater connected with the heating layer 22 and in signal connection with the control and calculation center 50; when the control calculation center 50 judges that the concrete at the steel platform bracket placement part 2 needs to be heated, the control calculation center controls the heater to work, heat is conducted to the steel platform bracket placement part 2 in a targeted mode through the heating layer 22 and the heat conduction layer 21, accordingly, the curing temperature of the concrete is effectively controlled, the construction difficulty is reduced, in addition, a reserved hole is formed in the heat conduction layer 21 serving as a base plate, a constructor can conveniently fix the concrete heating and humidifying strength curing device at the steel platform bracket placement part 2 at the hole through bolts, and the disassembly and assembly are convenient.
The heating layer 22 is formed by laying a plurality of groups of heating cables connected in series on the surface of the heat conduction layer 21, the heat conduction layer 21 is made of an aluminum plate, heat conduction is uniform, the heat insulation layer is made of a non-heat-conducting chemical material, such as a foam plate and the like, heat transfer is prevented and blocked, the heater adopts a rechargeable constant-temperature current heater, and high-altitude operation is more convenient.
As shown in fig. 6 and 7, the humidification and humidity control device 30 includes: the ultrasonic humidifier comprises an atomizer 31, a fan 33 and a circuit board, wherein the ultrasonic high-frequency oscillation of the atomizer 31 atomizes water in the water box 32 to generate ultra-micro particles with the diameter of only 1-5 microns, the particles are uniform and can be suspended in air for a long time, the size of humidity is controlled by controlling the air volume of the fan 33 and the atomizing speed, the relative humidity of air around the steel platform bracket place 2 is measured by a temperature and humidity sensor 40, and the relative humidity of the air is regulated by a control and calculation center 50.
As shown in fig. 1, the device also comprises a shell body which is adapted to the opening of the 2 holes at the position where the steel platform bracket is placed, wherein the shell body is composed of an inclined top plate and three side plates connected with the inclined top plate, namely, the shell body is not provided with a horizontal bottom plate, the strength detection device 10, the humidification and humidity control device 30 and the control and calculation center 50 are fixed in the shell body, the strength detection device 10 needs to be in direct contact with concrete on the horizontal surface of the opening, therefore, the shell body is not provided with a bottom plate; the top of the opening of the steel platform bracket placing part 2 is provided with an embedded bolt 3, and the shell can be connected in the opening of the steel platform bracket placing part 2 through a bolt and is used for fixing the concrete heating and humidifying strength maintenance device of the steel platform bracket placing part 2.
Example two: the concrete heating and humidifying strength maintenance method at the position where the bracket of the steel platform is placed is described by combining the figures 1 to 7, and the concrete steps are as follows:
s1: carrying out calibration test on the concrete strength measured by an ultrasonic instrument, measuring the wave velocity v of the concrete member in the curing process, and establishing the wave velocity v and the concrete strength fcEstablishing a concrete strength development curve;
s2: in the concrete pouring process of the steel platform bracket place 2, at least one temperature and humidity sensor 40 with built-in emission signals is embedded in the concrete, after the concrete pouring is finished, a concrete heating and humidifying strength maintenance device of the steel platform bracket place 2 is installed on the steel platform bracket place 2, the wave velocity v1 and v2 … vi in the concrete maintenance process of the steel platform bracket place 2 is measured by a strength detection device 10 at intervals, and the wave velocity v and the concrete strength f obtained in the step S1 are utilizedcCalculating the concrete strength f1 and f2 … fi corresponding to the wave velocity v1 and v2 … vi, and judging whether the real-time concrete strength vi of the steel platform bracket laying part 2 reaches a concrete strength target value corresponding to the concrete strength development curve in the step S1;
s3: and controlling the heating temperature control device 20 to heat or cool and/or controlling the humidifying and humidity controlling device 30 to humidify by using the control and calculation center 50, so that the real-time concrete strength fi of the steel platform bracket placing part 2 reaches the concrete strength target value corresponding to the concrete strength development curve in the step S1.
The invention relates to a concrete heating and humidifying strength support for a bracket shelf of a steel platformThe method comprises firstly, carrying out calibration test on the concrete strength measured by ultrasonic wave, and establishing wave velocity v and concrete strength fcThe relation of (a) and a concrete strength development curve; after concrete pouring of the steel platform bracket laying part 2 is completed and the concrete heating and humidifying strength maintenance device of the steel platform bracket laying part 2 is installed, the wave velocity of concrete is measured at intervals, and the wave velocity v and the concrete strength f are usedcThe relational expression of the above-mentioned formula calculates and obtains the correspondent concrete strength, control the calculation center 50 and judge whether the real-time concrete strength reaches the concrete strength target value correspondent to the concrete strength development curve, and control the heating temperature-controlling device 20 to heat or cool, and/or control the humidifying humidity-controlling device 30 to humidify and make it reach the concrete strength target value correspondent to the concrete strength development curve, the concrete heating and humidifying strength maintenance method of steel platform bracket laying place 2 of the invention, through heating and/or humidifying the concrete of steel platform bracket laying place 2 pertinently, not only improve the concrete strength of steel platform bracket laying place 2, but also can prevent the concrete from producing shrinkage and crack, and ensure the concrete pouring quality of steel platform bracket laying place 2, thus under the condition that the whole load of the whole steel platform is raised and the construction is advanced, so that the steel platform corbel rest 2 reaches a predetermined bearing capacity.
In step S1, the wave velocity v of the concrete and the concrete strength fcThe relationship of (1) is derived as follows:
s11: calculating the concrete wave velocity v according to the relation between the concrete wave velocity and time and the relation between the concrete wave velocity and distance measurement;
the relationship between the concrete wave speed and the time is as follows:
wherein v is the concrete wave velocity (km/s);
liranging (mm) for ultrasonic instruments;
tithe sound time reading (mu s) of the ultrasonic wave at the current moment;
t0is ultrasonic waveInitial sound time reading (μ s);
the relation between the concrete wave speed and the distance measurement is as follows:
wherein liRanging (mm) for ultrasonic instruments;
l1i、l2idistance (mm) between the ultrasonic instrument and the edge of the concrete member;
the relation between the concrete wave velocity and the time and distance measurement is from CECS _ 02: 2005 technical specification for testing concrete strength by ultrasonic rebound synthesis method.
S12: calculating the elastic modulus E of the concrete according to the relation between the wave velocity and the elastic modulus of the concrete;
wherein v is the concrete wave velocity (km/S) obtained in the step S11;
mu is the Poisson's ratio of the concrete;
rho is the density of concrete, and both mu and rho can be obtained by measuring through a commercially available instrument;
s13: obtaining the concrete strength f according to the relation between the elastic modulus and the concrete strengthc；
Wherein f iscThe concrete strength is adopted;
e is the elastic modulus calculated in step S12.
In conclusion, the method indirectly derives the concrete strength by using the relational expression of the concrete wave velocity and the time and the relational expression of the concrete wave velocity and the distance measurement, and since the concrete wave velocity, the time and the distance measurement can be measured by the existing instrument, the concrete strength is indirectly derived by using the relational expression, the method is convenient and easy to implement, has high accuracy, and solves the problem that the resiliometer cannot detect the surface strength of the steel platform bracket placing part 2.
In the step S1, in the calibration test of measuring the concrete strength by the ultrasonic instrument, the internal wave velocity of the concrete member is measured for 1 to 7 days; in step S2, the required strength of the steel platform bracket rest 2 is calculated according to the design of the whole steel platform formwork, the concrete strength development curve of the steel platform bracket rest 2 in 1-5 days is calculated, then the steel platform bracket rest 2 is divided into a plurality of time periods, each time period is 2-3 hours, namely the wave velocity v1 and v2 … vi in the concrete curing process of the steel platform bracket rest 2 is measured by the strength detection device 10 every 2-3 hours.
Example three: different from the second implementation, in the step S2, the temperature and humidity outside the concrete are measured by the temperature and humidity sensor 40 disposed in the 2-hole opening at the position where the steel platform bracket is placed, and the concrete strength f is obtained by using a maturity formula, i.e., a relational expression between the temperature and humidity outside the concrete and the concrete strengthc；
The relationship between the external temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein, t0The starting time for the development of concrete strength;
tethe current moment of concrete strength development;
fcfor the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete is data directly provided by commercial concrete;
kTmodel parameters (rate constants) that take into account the effects of curing temperature and curing humidity;
the above model parameter kTThe relationship with temperature and humidity is as follows:
kT＝A(h)×e(BT)
wherein k isTModel parameters (rate constants) that take into account the effects of curing temperature and curing humidity;
a (h) is a parameter considering the humidity of maintenance, and h is the current time teThe external humidity of the concrete at the steel platform bracket placing position 2;
b is a constant;
t is the current time TeSteel platform corbel rest 2 external temperature of concrete.
In summary, the method measures the temperature and humidity outside the concrete through the temperature and humidity sensor 40 arranged in the opening 2 of the steel platform corbel placing position, and indirectly deduces the concrete strength by using the maturity formula, and since the temperature and the humidity outside the concrete can be measured by the temperature and humidity sensor 40, the concrete strength is indirectly deduced by using the maturity formula, the method is convenient and easy to implement, has high accuracy, and solves the problem that the resiliometer cannot detect the surface strength of the steel platform corbel placing position 2.
Example four: different from the third embodiment, in the step S2, the temperature and humidity inside the concrete are measured by the temperature and humidity sensor 40 disposed inside the concrete wall body near the steel platform corbel placing part 2, and the concrete strength f is obtained by using the hydration degree formula, i.e. the relational expression between the temperature and humidity inside the concrete and the concrete strengthc；
The relation between the internal temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein f isc(α) is the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete;
α(te) For the current time teThe degree of concrete hydration of;
α0the initial hydration degree of the concrete;
αuthe final hydration degree of the concrete;
a is a constant;
the above current time teConcrete hydration degree of α (t)e) And temperature, humidityThe relationship of (A) is as follows:
α (t) among theme) For the current time teThe degree of concrete hydration of;
αecthe hydration degree is the hydration degree when the relative humidity in the concrete begins to decrease;
tecthe equivalent age when the relative humidity in the concrete begins to decline;
RH is the current time teThe relative humidity inside the concrete;
k, p are constants;
n is the nominal reaction order.
In summary, the method measures the temperature and humidity inside the concrete through the temperature and humidity sensor 40 arranged in the concrete wall body close to the steel platform corbel placing part 2, and indirectly deduces the concrete strength by using the hydration degree formula, and the temperature and humidity inside the concrete can be measured by the temperature and humidity sensor 40 and indirectly deducted by using the hydration degree formula, so that the method is convenient and easy to implement, has high accuracy, and solves the problem that the resiliometer cannot detect the surface strength of the steel platform corbel placing part 2.
Example five: different from the third embodiment and the fourth embodiment, in the step S2, data of the temperature and humidity sensor 40 inside the concrete is read, if the internal temperature is low, the wave velocity of the concrete is measured through the strength detection device 10 and the real-time concrete strength is obtained through calculation, meanwhile, the temperature and humidity outside the concrete are measured through the temperature and humidity sensor 40 arranged in the opening 2 of the steel platform bracket placement part, the concrete strength is obtained through a maturity formula, the temperature and humidity inside the concrete are measured through the temperature and humidity sensor 40 arranged in the concrete wall body close to the steel platform bracket placement part 2, the concrete strength is obtained through a hydration formula, and the data of the concrete strength is corrected to obtain the closest data; in step S3, the heating temperature control device 20 is controlled by the control and calculation center 50 to heat, the temperature inside and outside the concrete is kept to be slowly raised, too high temperature cannot be raised at one time, meanwhile, the steel platform bracket placing part 2 is humidified by the humidification and humidity control device 30, the temperature and humidity inside and outside the concrete and the concrete strength of the steel platform bracket placing part 2 are measured every 2-3 hours, if the strength is developed too fast, the temperature can be slightly reduced, the cracking risk caused by too high temperature is prevented, and when the strength is developed too slowly and too fast each time, correction is performed through the difference of calculated strength, so that the concrete at the steel platform bracket placing part 2 can reach the preset strength and can be developed safely and effectively.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (12)
1. Concrete heating humidification intensity curing means of department is shelved to steel platform bracket, its characterized in that includes:
the strength detection device is arranged on the horizontal plane of the hole at the position where the steel platform bracket is placed, and the real-time concrete strength at the position where the steel platform bracket is placed is calculated through the internal wave velocity of the concrete measured by the strength detection device;
the heating temperature control device is vertically arranged on the side surface of the core cylinder wall body, covers the peripheral wall body of the opening of the steel platform bracket placing position and is used for heating the concrete of the peripheral wall body of the opening of the steel platform bracket placing position;
the humidifying and humidity-controlling device is arranged in a hole at the position where the steel platform bracket is placed and used for adjusting the air humidity around the position where the steel platform bracket is placed;
the temperature and humidity sensors are arranged in the opening of the steel platform bracket placing position, and at least one temperature and humidity sensor is arranged in the concrete wall body close to the steel platform bracket placing position;
the control calculation center is arranged in the opening of the steel platform bracket placement part and is respectively in signal connection with the heating temperature control device, the humidifying and humidity control device and the temperature and humidity sensors, and the control calculation center is used for judging whether the real-time concrete strength of the steel platform bracket placement part reaches a target value or not and controlling the heating temperature control device and the humidifying and humidity control device to heat and/or humidify the concrete of the wall body around the opening of the steel platform bracket placement part until the real-time concrete strength of the steel platform bracket placement part reaches the target value.
2. The steel platform bracket place concrete heating and humidifying intensity curing device of claim 1, wherein the intensity detection device comprises: the ultrasonic intensity detector is arranged on the horizontal plane of the opening at the position where the steel platform bracket is placed, the transmitting transducer is arranged on the horizontal plane of the opening at the position where the steel platform bracket is placed, the receiving transducer is arranged on the outer wall surface of the position where the steel platform bracket is placed, and the transmitting transducer and the receiving transducer are respectively connected with the ultrasonic intensity detector.
3. The steel platform bracket place concrete heating and humidifying intensity curing device of claim 1, wherein the heating temperature control device comprises:
the heat conduction layer is attached to and fixed on the outer side wall surface of the place where the steel platform bracket is placed, and the heat conduction layer is provided with reserved holes corresponding to the holes at the place where the steel platform bracket is placed;
the heating layer is laid on the surface of the heat-conducting layer;
the heat insulation layer is arranged on the outer sides of the heat conduction layer and the heating layer;
and the heater is connected with the heating layer and is in signal connection with the control calculation center.
4. The steel platform bracket place concrete heating and humidifying intensity curing device of claim 3, characterized in that: the heat conducting layer is made of aluminum plates, the heating layer is formed by laying multiple groups of heating cables connected in series on the surface of the heat conducting layer, and the heat insulating layer is made of non-heat conducting materials.
5. The steel platform bracket rest concrete heating and humidifying strength curing device as claimed in claim 1, wherein the humidifying and humidity controlling device at least comprises: ultrasonic humidifier and water box, ultrasonic humidifier with control calculation center signal connection, wherein, ultrasonic humidifier includes atomizer and fan at least, the ultrasonic wave high frequency oscillation that the atomizer sent will water in the water box atomizes, through control the size of fan amount of wind and the size of atomizing speed control humidity.
6. The steel platform bracket place concrete heating and humidifying strength maintenance device according to claim 1, further comprising a shell body adapted to the steel platform bracket place hole, wherein the shell body is composed of a top plate and three side plates connected with the top plate, the strength detection device, the humidifying and humidity controlling device and the control and calculation center are fixed in the shell body, and the shell body is connected to the steel platform bracket place hole through bolts.
7. The method for maintaining the concrete heating and humidifying strength at the position where the steel platform bracket is placed is characterized by comprising the following steps of:
s1: carrying out calibration test on the concrete strength measured by an ultrasonic instrument, measuring the wave velocity of the concrete member in the curing process, establishing a relational expression of the wave velocity and the concrete strength, and establishing a concrete strength development curve;
s2: in the concrete pouring process of the steel platform bracket laying position, at least one temperature and humidity sensor is pre-buried in concrete, after the concrete pouring is finished, a concrete heating and humidifying strength maintenance device of the steel platform bracket laying position is installed at the steel platform bracket laying position, at least one temperature and humidity sensor is arranged in a hole in the steel platform bracket laying position, the wave velocities v1 and v2 … vi in the concrete maintenance process of the steel platform bracket laying position are measured through a strength detection device at intervals of a time period, the concrete strengths f1 and f2 … fi corresponding to the wave velocities v1 and v2 … vi are calculated by using the relational expression between the wave velocities and the concrete strength obtained in the step S1, and whether the real-time concrete strength of the steel platform bracket laying position reaches the concrete strength target value corresponding to the concrete strength development curve in the step S1 is judged;
s3: and controlling the heating temperature control device to heat or cool and/or controlling the humidifying humidity control device to humidify by using the control and calculation center, so that the real-time concrete strength at the position where the steel platform bracket is placed reaches the target value of the concrete strength corresponding to the concrete strength development curve in the step S1.
8. The method for maintaining the heating and humidifying strength of the concrete at the position where the bracket of the steel platform is placed according to claim 7, wherein the method comprises the following steps: in the step S1, in a calibration test for measuring the concrete strength by an ultrasonic instrument, the internal wave velocity of the concrete member in 1 to 7 days is measured; in the step S2, the required strength of the steel platform corbel rest is calculated according to the design of the whole steel platform formwork, the concrete strength development curve of the steel platform corbel rest in 1-5 days is calculated, then the steel platform corbel rest is divided into a plurality of time periods, each time period is 2-3 hours, and the wave velocity v1 and v2 … vi in the concrete curing process of the steel platform corbel rest in each time period is measured.
9. The method for maintaining the heating and humidifying strength of the concrete at the position where the bracket of the steel platform is placed according to claim 7, wherein in the step S1, the wave velocity v and the strength f of the concretecThe relationship of (1) is derived as follows:
s11: calculating the concrete wave velocity v according to the relation between the concrete wave velocity and time and the relation between the concrete wave velocity and distance measurement;
the relationship between the concrete wave speed and the time is as follows:
wherein v is the concrete wave velocity (km/s);
liranging (mm) for ultrasonic instruments;
tithe sound time reading (mu s) of the ultrasonic wave at the current moment;
t0initial sound time readings (mus) of the ultrasonic waves;
the relation between the concrete wave speed and the distance measurement is as follows:
wherein liRanging (mm) for ultrasonic instruments;
l1i、l2idistance (mm) between the ultrasonic instrument and the edge of the concrete member;
s12: calculating the elastic modulus E of the concrete according to the relation between the wave velocity and the elastic modulus of the concrete;
wherein v is the concrete wave velocity (km/S) obtained in the step S11;
mu is the Poisson's ratio of the concrete;
rho is the density of the concrete;
s13: obtaining the concrete strength f according to the relation between the elastic modulus and the concrete strengthc；
Wherein f iscThe concrete strength is adopted;
e is the elastic modulus calculated in step S12.
10. The method for maintaining the concrete heating and humidifying strength at the position where the steel platform bracket is placed is characterized by comprising the following steps of:
s1: carrying out calibration test on the concrete strength measured by an ultrasonic instrument, measuring the wave velocity of the concrete member in the curing process, establishing a relational expression of the wave velocity and the concrete strength, and establishing a concrete strength development curve;
s2: the method comprises the following steps that in the concrete pouring process of a steel platform bracket laying position, at least one temperature and humidity sensor is pre-buried in concrete, after the concrete pouring is finished, a concrete heating and humidifying strength curing device of the steel platform bracket laying position is installed at the steel platform bracket laying position, and at least one temperature and humidity sensor is arranged in a hole of the steel platform bracket laying position; measuring the temperature and humidity outside the concrete by a temperature and humidity sensor arranged in a cave at the position where the steel platform bracket is placed, and obtaining the concrete strength by utilizing a maturity formula; and/or measuring the temperature and humidity inside the concrete through a temperature and humidity sensor arranged in the concrete wall body close to the position where the steel platform bracket is placed, and obtaining the concrete strength by utilizing a hydration degree formula; judging whether the real-time concrete strength at the position where the steel platform bracket is placed reaches a target value of concrete strength corresponding to the concrete strength development curve in the step S1;
s3: and controlling the heating temperature control device to heat or cool and/or controlling the humidifying humidity control device to humidify by using the control and calculation center, so that the real-time concrete strength at the position where the steel platform bracket is placed reaches the target value of the concrete strength corresponding to the concrete strength development curve in the step S1.
11. The method for maintaining the heating and humidifying strength of the concrete at the position where the bracket of the steel platform is placed according to claim 10, wherein the method comprises the following steps: in the step S2, the temperature and the humidity outside the concrete are measured through the temperature and humidity sensor arranged in the opening of the place where the steel platform bracket is placed, and the concrete strength f is obtained by utilizing a maturity formula, namely a relational expression of the external temperature and the humidity of the concrete and the concrete strengthc；
The relationship between the external temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein, t0The starting time for the development of concrete strength;
teis concreteThe current moment of intensity development;
fcfor the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete is data directly provided by commercial concrete;
kTmodel parameters considering the influence of curing temperature and curing humidity;
the above model parameter kTThe relationship with temperature and humidity is as follows:
kT＝A(h)×e(BT)
wherein k isTModel parameters considering the influence of curing temperature and curing humidity;
a (h) is a parameter considering the humidity of maintenance, and h is the current time teThe external humidity of the concrete at the place where the steel platform bracket is placed;
b is a constant;
t is the current time TeThe external temperature of the concrete where the steel platform corbels are placed.
12. The method for maintaining the heating and humidifying strength of the concrete at the position where the bracket of the steel platform is placed according to claim 10, wherein the method comprises the following steps: in the step S2, the temperature and humidity inside the concrete are measured by the temperature and humidity sensor arranged in the concrete wall close to the place where the steel platform bracket is placed, and the concrete strength f is obtained by using the hydration degree formula, i.e. the relational expression of the temperature and humidity inside the concrete and the concrete strengthc；
The relation between the internal temperature and humidity of the concrete and the strength of the concrete is as follows:
wherein f isc(α) is the current time teThe concrete strength of (a);
fc,uthe ultimate compressive strength of the concrete;
α(te) For the current time teThe degree of concrete hydration of;
α0the initial hydration degree of the concrete;
αuthe final hydration degree of the concrete;
a is a constant;
the current time teConcrete hydration degree of α (t)e) And temperature and humidity as follows:
α (t) among theme) For the current time teThe degree of concrete hydration of;
αecthe hydration degree is the hydration degree when the relative humidity in the concrete begins to decrease;
tecthe equivalent age when the relative humidity in the concrete begins to decline;
RH is the current time teThe relative humidity inside the concrete;
k, p are constants;
n is the nominal reaction order.
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