Device for automatic temperature condition regulation during thermal reinforced concrete structure treatment

FIELD: construction, particularly devices for thermal treatment of reinforced structures during in-situ structure erection with the use of automatic temperature condition control means.

SUBSTANCE: device comprises form, heat-sensing means, heaters and computer. Heat-sensing means are placed in form. Heaters are laid on reinforcing cage of monolithic reinforced concrete structure and fixed thereto. Heat-sensing means are linked to automatic digital power regulator including indication and control unit and digital control unit connected with control computer by means of signal converter. To provide visual control automatic power regulator is provided with concrete temperature display panel, which indicates concrete temperature in each measurement point and volumetrically weighed average concrete temperature.

EFFECT: decreased power inputs and possibility to control thermal field transformation after heater switching-on or switching-off in correspondence with thermal limiters of valid regulation documents.

2 cl, 3 dwg

 

The invention relates to the construction, namely, devices for heat treatment erected in the conditions of the construction site structures made of reinforced concrete with the use of automatic control of thermal processes.

The known device for the automatic control of complex objects, including discrete nature of the technological cycle (see, for example, patents 2105343, M CL G05B 19/18, publ. 20.02.1998, 2102788, M CL G05B 19/18, publ. 20.01.1998, 2041494, M CL G06F 17/00, publ. 21.12.1992), including registers input and output, memory blocks, the block comparison and counter addresses, the block management block management solutions, etc. used to solve problems of identification and analysis of situations, processes or phenomena of any nature described by finite sets of signs. In terms of functionality, these devices are unsuitable for process control of heat treatment of concrete for winter concreting monolithic building structures.

It is also known a device for the heat treatment of monolithic reinforced concrete structures (patent 2249502, M CL VV 11/24, publ. 10.04.2005 - prototype), including formwork with established therein heating elements, temperature sensors with independent control channels, temperature sensors installed in a monolithic design, the sensor environment is s, the unit of magnetic starters, a personal computer, control unit, control and registration.

The drawback of the prototype is that it is designed for heat treatment of isothermal ageing in continuous operation of the heating elements that can significantly reduce energy consumption through the use of thermal inertia of the concrete when the discrete mode of operation of the heating elements in the specified temperature range.

The technical problem solved by the invention is a significant reduction of energy consumption and technical ability to control the speed adjustment of the temperature field after switching on or off of the heater according to the temperature limitations of existing regulations.

This is achieved by a device for automatic regulation of the temperature during heat treatment of monolithic reinforced concrete, including formwork, temperature sensors, heaters, computer, sensors installed in the formwork, the heaters are placed and fixed to the reinforcement cage monolithic reinforced concrete structures, heaters, thermocouples connected to a digital automatic power control, consisting of a display unit and a control and regulating unit of the digital, connected to the frame through the transducer signals from the host computer. To provide visual control digital automatic power control device provided with a panel for displaying the temperature of concrete in each measurement point and volume-weighted mean temperature of the concrete.

The invention is illustrated in the drawings. Figure 1 shows a diagram of laying electric heating wires, figure 2 - diagram of the device for automatic regulation of temperature during heat treatment monolithic concrete structures, figure 3 - algorithmic Manager to manage discrete mode of heat treatment of concrete in the temperature range of tmax-tmin.

The heaters in the form of electric wires 1, stacked and fixed on the reinforcing frame 2 (figure 1), placed concrete. The sensors 3 and the heater 1 shown in figure 2 as resistors R1, R2, R3, are the object of control 4. The findings of the heater 1 and the sensors 3 are connected with a digital automatic power control device 5 consisting of a display unit and control 6 and the regulating unit of the digital 7 through the signal Converter 8 is connected to the host computer 9; a, b, C - phase, S1 is the power switch.

In accordance with the developed program to enable the device control computer 9 are calculated and entered in the block in the paths and control 6 maximum and minimum temperature of the temperature regime of heat treatment of the concrete structure with the minimum energy consumption for the heating of the concrete, the parameters for the calculation of the electric circuit of the heaters, for example the total length of the electric wires, the geometrical dimensions of reinforced concrete structures, the average temperature on the faces of the structure to the beginning of the heat treatment, the duration of the periods of on and off of the heaters, the time step for discrete control of ambient temperature and temperature of heat treatment.

In a given interval tmax-tminmeasured current temperature in 1-6 points of measurement depending on the type of structure on the contact of the casing with concrete by the sensors 3, then in accordance with the developed program the host computer 9 is determined by the speed adjustment of the temperature field in the concrete after turn on or off the heaters. The results of this calculation in case of exceeding the maximum allowable quantities of speed adjustment of the temperature field in the concrete with unit display and control 6 and the regulating unit of the digital 7 is the discrete decrease or increase the total output of all heaters, respectively, when they are switched on or off. The signals from the control object and control 4 is converted through the transformers T1, T2, T3 in the currents Ia, Ib, Ic and voltage Ua, Ub, Uc, depending on the values which the management is of the thyristors 10, regulating the on and off heaters 1.

Visually temperature of concrete in each measurement point and volume-weighted mean temperature of the concrete is displayed on the instrument panel digital automatic power control 5.

Figure 3 shows a diagram of an algorithmic Manager to manage discrete mode of heat treatment of concrete in the temperature range of tmax-tmin, with which automatic temperature control by heat treatment monolithic concrete structures by process control on-off heaters taking into account the maximum and minimum allowable temperature of the concrete and the limiting values of the speed adjustment of the temperature field after switching on or off the heaters. Notes to figure 3: 1 is a graph showing the change of volume-weighted temperature; 2 - graph of the intensity of the heat flux; tBS- initial concrete temperature; Tr is the period of heating the concrete to the reference temperature; Round - the period of curing of concrete with a controlled thermal conditions; TOST- the cooling-off period of the concrete; TR- period of a set of concrete critical strength; N is the total capacity of all heaters, W; M is the total power of the heaters for this design, W; R - parameters the cycle; τ - time, h; t - temperature, °C.

Production tests on construction sites Novosibirsk confirmed the possibility of saving up to 50% for winter concreting structures prismatic form and demonstrated technical ability to control the speed adjustment of the temperature field after switching on or off of the heater according to the temperature limitations of existing regulations. In addition, the device for automatic regulation of the temperature during heat treatment monolithic concrete structures can improve process reliability by eliminating the "human factor" and possible errors in the calculation of electrical networks heaters, and direct contact heaters with concrete has a high thermal efficiency.

1. Device for automatic regulation of the temperature during heat treatment of monolithic reinforced concrete, including formwork, temperature sensors, heaters, computer, characterized in that the sensors installed in the formwork, the heaters are placed and fixed to the reinforcement cage monolithic reinforced concrete structures, the findings of the heaters and the temperature sensors are connected with a digital automatic regulator capacity and, consisting of a display unit and a control and regulating unit of the digital, through a signal Converter connected to the host computer.

2. The device according to claim 1, characterized in that to provide visual control digital automatic power control supplied with the instrument panel to display the temperature of concrete in each measurement point and volume-weighted mean temperature of the concrete.



 

Same patents:

FIELD: building industry; methods of production of the construction products at the building industry works.

SUBSTANCE: the invention is pertaining to the field of building industry, in particular, to the method of production of the construction products at the building industry works and may be used for manufacture of the reinforced concrete, including the spatial structures with the heat-insulating layer. The technical result of the invention is reduction of the power input, improvement of the quality and expansion of list of products. The method of manufacture of double-layer reinforced concrete products includes the consecutive formation of the constructive and the heat-insulating layers of the reinforced concrete and its thermal treatment. The heat-insulating layer with the average density of 450-500 kg/m3 made out of the vermiculite-concrete mixture with flowability of 3-5 cm is molded by the vibrobeam with the simultaneous its reinforcement by the woven net in top level. After the structure achieves the plastic strength of 0.015-0.025 MPa, then begin the molding the constructive layer and conduct the thermal treatment by the method of the contact heating from the side of the heat-insulating layer.

EFFECT: the invention ensures reduction of the power input, improvement of the quality and expansion of list of products.

FIELD: method and equipment for manufacturing gypsum plates.

SUBSTANCE: method involves the following steps: first step includes molding plate; second step includes hardening by hydration process until hydrated article is produced with hydration extent within the range from 33% to 80%; third step includes continuing hydration process in at least one rotating drum by rotating plate around central axis; fourth step includes drying process. Intermediate cutting process may be provided between second and third steps, said cutting process may be effectuated in accordance with wire principle. Apparatus has linear zone for partial hardening and hydration, and at least one hydration drum comprising central axis around which multiplicity of branches are arranged. Each branch in drum may be divided into multiplicity of levers, with surface of said levers making from about 50% to about 99% the surface of respective branch. Drum may have from 10 to 150 branches, preferably from 40 to 120 branches. Hardening and hydration zone and drum may be arranged in two axes extending in parallel with one another.

EFFECT: improved quality of articles, improved maintenance and operating conditions.

12 cl, 11 dwg

FIELD: building, particularly for concreting cast-in-place and precast reinforced concrete structures along with concrete curing temperature regulation.

SUBSTANCE: method involves laying and compacting concrete mix under continuous concrete mix curing temperature control; heating central concrete layers with heating reinforcement when outer concrete layers are in elasto-plastic state. Heating reinforcement is spaced a distance "a" from surface. The heating is carried out simultaneously with surface heat-shielding. Distance "a" is determined as a=δeq(tav-ts)/(ts-ta), m, where δeq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, Rs, m; tav - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; ts - time-average temperature at concrete surface calculated by estimated heating time, deg; δeq is determined as δeq=Rs·λ·F, m, where Rs is heat resistance of rigging with form Rr including thermal resistance Ra of heat transfer from rigging to ambient air, h·deg/kcal; Rs=Rr+Ra=(δr/( λr·F))+(1/(α·F)), h·deg/kcal, where δr is thickness of rigging, m; λr is rigging heat conductivity factor kcal/(m·h·deg), α is rigging surface heat-transfer coefficient kcal/(m2·h·deg), λ is concrete(reinforced concrete) heat conductivity kcal/(m·h·deg); F=1m2 - rigging surface area for thermal resistance calculation, m2. Amount of heat Q used to heat part of member to be heated having length (height) of 1.0 m and cross-sectional width of 1.0 m is determined from Q=(tav-ts)(m+(τ·λ·F/a), where m is constant equal to 60-180 kcal/deg and τ is calculated heating time, hours. The heating reinforcement is heating wires or pipes adapted for hot water circulation.

EFFECT: reduced temperature stresses and prevention of crack formation during structure concreting, as well as possibility to regulate curing temperature.

4 cl, 1 ex, 4 dwg

FIELD: apparatus or processes for treating or working, namely curing, setting or hardening, the shaped articles.

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20 cl, 11 dwg

FIELD: building industry branches, namely apparatuses for heat treatment of constructions of reinforced concrete erected in building site with use of automatic control of heat treatment processes.

SUBSTANCE: apparatus includes concrete form having electric heating units mounted in its boards for convection-irradiation heating of concrete mixture and heating members mounted in bottom of concrete form for convection-irradiation heating; temperature pickups having individual control circuits and connected to inlets of heat regulators. Outlets of heat regulators are connected through switching units having magnetic starters with respective electric heating units. Each control circuit includes at least six temperature pickups placed in monolithic construction and pickup for measuring temperature of environmental air. Said pickups are connected with inlets of respective programmed heat regulator for supplying control signals.

EFFECT: enhanced quality of constructions.

3 cl, 4 dwg

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The invention relates to the construction and manufacture of building products of concrete with the use of automatic process control of heat treatment

The invention relates to the construction materials industry, in particular to workshops for the production of prestressed concrete products

FIELD: building industry branches, namely apparatuses for heat treatment of constructions of reinforced concrete erected in building site with use of automatic control of heat treatment processes.

SUBSTANCE: apparatus includes concrete form having electric heating units mounted in its boards for convection-irradiation heating of concrete mixture and heating members mounted in bottom of concrete form for convection-irradiation heating; temperature pickups having individual control circuits and connected to inlets of heat regulators. Outlets of heat regulators are connected through switching units having magnetic starters with respective electric heating units. Each control circuit includes at least six temperature pickups placed in monolithic construction and pickup for measuring temperature of environmental air. Said pickups are connected with inlets of respective programmed heat regulator for supplying control signals.

EFFECT: enhanced quality of constructions.

3 cl, 4 dwg

FIELD: apparatus or processes for treating or working, namely curing, setting or hardening, the shaped articles.

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EFFECT: increased panel quality, decreased production and maintenance costs and improved operating conditions.

20 cl, 11 dwg

FIELD: building, particularly for concreting cast-in-place and precast reinforced concrete structures along with concrete curing temperature regulation.

SUBSTANCE: method involves laying and compacting concrete mix under continuous concrete mix curing temperature control; heating central concrete layers with heating reinforcement when outer concrete layers are in elasto-plastic state. Heating reinforcement is spaced a distance "a" from surface. The heating is carried out simultaneously with surface heat-shielding. Distance "a" is determined as a=δeq(tav-ts)/(ts-ta), m, where δeq - thickness of conditional equivalent concrete layer corresponding to surface thermal resistance, Rs, m; tav - time-average concrete temperature calculated by estimated time of heating directly in heating area, deg; ts - time-average temperature at concrete surface calculated by estimated heating time, deg; δeq is determined as δeq=Rs·λ·F, m, where Rs is heat resistance of rigging with form Rr including thermal resistance Ra of heat transfer from rigging to ambient air, h·deg/kcal; Rs=Rr+Ra=(δr/( λr·F))+(1/(α·F)), h·deg/kcal, where δr is thickness of rigging, m; λr is rigging heat conductivity factor kcal/(m·h·deg), α is rigging surface heat-transfer coefficient kcal/(m2·h·deg), λ is concrete(reinforced concrete) heat conductivity kcal/(m·h·deg); F=1m2 - rigging surface area for thermal resistance calculation, m2. Amount of heat Q used to heat part of member to be heated having length (height) of 1.0 m and cross-sectional width of 1.0 m is determined from Q=(tav-ts)(m+(τ·λ·F/a), where m is constant equal to 60-180 kcal/deg and τ is calculated heating time, hours. The heating reinforcement is heating wires or pipes adapted for hot water circulation.

EFFECT: reduced temperature stresses and prevention of crack formation during structure concreting, as well as possibility to regulate curing temperature.

4 cl, 1 ex, 4 dwg

FIELD: method and equipment for manufacturing gypsum plates.

SUBSTANCE: method involves the following steps: first step includes molding plate; second step includes hardening by hydration process until hydrated article is produced with hydration extent within the range from 33% to 80%; third step includes continuing hydration process in at least one rotating drum by rotating plate around central axis; fourth step includes drying process. Intermediate cutting process may be provided between second and third steps, said cutting process may be effectuated in accordance with wire principle. Apparatus has linear zone for partial hardening and hydration, and at least one hydration drum comprising central axis around which multiplicity of branches are arranged. Each branch in drum may be divided into multiplicity of levers, with surface of said levers making from about 50% to about 99% the surface of respective branch. Drum may have from 10 to 150 branches, preferably from 40 to 120 branches. Hardening and hydration zone and drum may be arranged in two axes extending in parallel with one another.

EFFECT: improved quality of articles, improved maintenance and operating conditions.

12 cl, 11 dwg

FIELD: building industry; methods of production of the construction products at the building industry works.

SUBSTANCE: the invention is pertaining to the field of building industry, in particular, to the method of production of the construction products at the building industry works and may be used for manufacture of the reinforced concrete, including the spatial structures with the heat-insulating layer. The technical result of the invention is reduction of the power input, improvement of the quality and expansion of list of products. The method of manufacture of double-layer reinforced concrete products includes the consecutive formation of the constructive and the heat-insulating layers of the reinforced concrete and its thermal treatment. The heat-insulating layer with the average density of 450-500 kg/m3 made out of the vermiculite-concrete mixture with flowability of 3-5 cm is molded by the vibrobeam with the simultaneous its reinforcement by the woven net in top level. After the structure achieves the plastic strength of 0.015-0.025 MPa, then begin the molding the constructive layer and conduct the thermal treatment by the method of the contact heating from the side of the heat-insulating layer.

EFFECT: the invention ensures reduction of the power input, improvement of the quality and expansion of list of products.

FIELD: construction, particularly devices for thermal treatment of reinforced structures during in-situ structure erection with the use of automatic temperature condition control means.

SUBSTANCE: device comprises form, heat-sensing means, heaters and computer. Heat-sensing means are placed in form. Heaters are laid on reinforcing cage of monolithic reinforced concrete structure and fixed thereto. Heat-sensing means are linked to automatic digital power regulator including indication and control unit and digital control unit connected with control computer by means of signal converter. To provide visual control automatic power regulator is provided with concrete temperature display panel, which indicates concrete temperature in each measurement point and volumetrically weighed average concrete temperature.

EFFECT: decreased power inputs and possibility to control thermal field transformation after heater switching-on or switching-off in correspondence with thermal limiters of valid regulation documents.

2 cl, 3 dwg

FIELD: construction.

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EFFECT: improved strength characteristics used to erect objects of concrete building structures.

2 cl, 2 dwg, 3 ex

Curing room // 2454324

FIELD: process engineering.

SUBSTANCE: invention relates to construction and may be used for curing concrete articles. Proposed curing room comprises walls with inner flange, hydraulic gate frame mounted on wall edges, shield with inner surface provided with steam-and-water insulation coating and heat insulation, steam duct, and condensate drain chute. Hydraulic gate frame is made up of horizontal channels arranged horizontally along room walls to house elastic porous material for room sealing by absorbing condensed steam. Aforesaid shield is made up of carcass consisting of weight-reduced channels coated by heat-insulation material with inner cavities. Said shield serves to press elastic porous material against all edges of channel cavity.

EFFECT: high-reliability sealing.

2 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to method of controlling concrete thermal treatment. Proposed device comprises heater to heat laid concrete mix by heating wire or electrodes, measure mix temperature by temperature pickups, and system for automatic control over concrete article heating. Said system is composed of nondestructive control electronic transducers and instruments, i.e. USB-1, Pulsar-2 to take readings directly from early concrete, heating transformer KTP, double-ended lamps, multichannel temperature, heating and data reading interval meter, bus line, feed and heating devices, registrator and computer.

EFFECT: higher accuracy of control, stabilised temperature difference and concrete article and ambient medium.

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to concrete and reinforced concrete article drying chambers. Proposed chamber comprises walls, detachable translucent cover and heat power feed system. Chamber guard structure and said detachable cover are made of combined material including metal, asbestos sheet, foil with heat insulation provided with air layer confined by two layers of foil. Layer of asbestos at chamber inner walls is covered by foil. IR radiators, portable heat sensor are arranged at chamber bottom while water like with sprinklers is laid around the periphery. Electrical protection contact device is arranged ay chamber r top part.

EFFECT: decreased heat losses.

1 dwg

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