Heating unit for thermal treatment of concrete
(57) Abstract:Heating unit for thermal treatment of concrete includes a vertical outer and inner surface of the insulating casing, the upper ceiling box and the guide ribs and the heaters. Feature: heating unit equipped with a rotary air heater mounted on the canopy, vertical and horizontal screens, mounted respectively on the box and the guide ribs. 5 Il. The invention relates to a device for heat treatment of concrete and can be used in construction during the construction of monolithic construction projects.Currently, monolithic housing starts becoming more widely implemented in the construction industry.There are several ways to heat treatment of concrete, designed to give it the necessary strength. One of them keeping the concrete by means of a thermos, the essence of which consists in the use of heat supplied to the concrete prior to its installation in the casing and the heat released by the cement during curing concrete (guide for the production of concrete work in th method is its poor suitability for winter concreting at low ambient temperatures, as announced and released heat is not enough to cover the heat losses of the formwork. As a result of violations of the technological mode of hardening his final strength is significantly reduced.This disadvantage is eliminated in a variety of ways of heating the concrete in the mold during its hardening. One such method is the heating up of the concrete. When heating up electric current is passed through the concrete emitted during this heat is used for heating. The voltage supplied by the steel electrodes and rods installed in the thickness of the concrete or strip electrodes placed between the concrete and neocuproine formwork (usually made of wooden boards). (Guide for the production of concrete work in winter conditions, in areas of the Far East, Siberia and the Far North. M stroiizdat, 1982, S. 95). This method is unsuitable when the monolithic construction, when the whole casing is made of metal and through the volume of concrete are metal rods that connect the elements of the formwork, due to the complexity of compliance with electrical safety and trouble-free operation of electrical equipment.In monolithic domasco warmth through the dividing wall formwork in the surface layer of concrete from the heaters, installed between the outer surface of the casing and thermal insulation. The heat in the concrete is distributed due to the heat. The disadvantage of this method is the danger of local overheating and critical temperature deformations due to the inability to maintain a uniform supply of heat to the concrete, significant design complexity casing at high velocity high temperature (>7aboutWith/h). (Guide for the production of concrete work in winter conditions, the regions of the Far East, Siberia and the Far North. M stroiizdat, 1982, S. 139).Closest to the technical essence and the achieved effect in the present invention is a heating casing, the outer surfaces of which are heated by the heaters, and the inner surface of the air heated in the heater and circulating by natural convection in the volume bounded by the inner surfaces of the casing (guide for the production of concrete work in winter conditions, the regions of the Far East, Siberia and the Far North. M stroiizdat, 1982, S. 130).The invention is directed to improving the quality of monolithic structures and reduce the time the operator of the heat is used recirculation heating unit, and to compensate for heat losses to the environment of the heated structure is applied heating formwork.The difference from the prototype is that the installation for thermal treatment of concrete provided with a rotary heater, and on the ribs of the inner casing are screens. Therefore, the proposed solution meets the criterion of "novelty."In Fig. 1 shows a heating unit for thermal treatment of concrete, side view; Fig. 2 section b-b of Fig.1; Fig. 3 section a-a in Fig.2, the seal design; Fig. 4 the node I in Fig.2, the angular design of the seal of Fig. 5 site II in Fig.2, the outer shield casing.Heating unit for thermal treatment of concrete contains 1 internal, 2 external surface of the insulating casing and the upper ceiling of 3. On the surface casing is installed vertical box-shaped ribs formed by channel 4. In the space between the box-shaped ribs on the external surfaces of the casing 2 laid the tape heaters 5 and heat-insulating mineral wool mats 6. The space between the box-shaped ribs of the inner surfaces of the casing separated from the rest of the inside is tough frame structure, formed by the channel bars 10 and insulated mineral wool mats. On the frame overlap fasten the motor 11 connected to the rotor aerodynamic heating 12, the guide ribs 13, louvred grille 14 and the top of the screen 15.Overlap 3, the top of the screen 15 and the guide ribs 13 form a horizontal cavity 16. Between 1 internal and 2 external surfaces of the casing is filled concrete 17.Heating unit for thermal treatment of concrete works in the following way. The air pumped by the rotor aerodynamic heating 12, moves in a horizontal cavity 16, is rotated 90aboutand falls into the vertical air channels 9 of the casing, where, moving from top to bottom, cooled, transferring heat through the surface of the inner casing 1 concrete 17. After the air channel 9, the air expands and is directed through the internal volume of the installation of 7, the louvered grill 14 to the rotor 12. The rotor 12 also serves as a compressor and a generator of heat.The main heat necessary for the heat treatment of concrete occurs when the work of rotary air heater due to the effect of heat losses generated during rabona tract. Band heaters 5 are used for compensation of heat loss of the heated concrete in the environment.Used as the heat generator rotor aerodynamic heating allows the efficient regulation of heat dissipation by changing the number of revolutions of the motor, and the throttle to keep air circulating louvered grill.The advantages of the proposed heating unit are intense and uniform heating of the concrete, the exact observance of the specified mode of heat treatment of concrete with effective and simple adjustment of thermal capacity of the rotary heater. HEATING unit FOR thermal TREATMENT of CONCRETE containing heat insulating casing with a vertical external and internal surfaces, which strengthened accordingly, the heaters and the box-shaped ribs, the upper cover, and the guide ribs, characterized in that the installation is equipped with a rotary air heater installed on brahnam overlapping, vertical and horizontal screens, mounted respectively on the box and the guide ribs.
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.
SUBSTANCE: method for gypsum panel forming involves shaping the panel, hardening and hydrating thereof and drying the panel during panel rotation. Device to realize above method is also disclosed.
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
SUBSTANCE: method for strengthening treatment of concrete products includes exposure of alternating rotary magnetic field with specified value of its intensity and frequency at components used in composition of initial concrete mix, when exposure of alternating rotary magnetic field is provided for all components making concrete without exception after their combination into integral volume directly in the product item itself after realisation of initial mixture components curing operation. This exposure is realised in moulded product without its extraction from used curb. The item itself performs function of closing connecting link in magnetic circuit used for generation of field. Treatment is carried out at intensity of alternating magnetic field 1×104-3×106 a/m; range of its frequencies 20-70 Hz for 1.5-4.5 hours. Cycles of treatment are repeated twice: in 160-180 hours with a delay of 0.3-0.7 hr and in 480-500 hours with a delay of 0.1-0.2 hour. Device used to realise the method comprises circuit developing alternating magnetic field and electric windings-coils mounted on it and connected to external source of AC current supply. One of plates making magnetic conducting circuit has through slot, dimensions of which make it possible to install the concrete product itself in it together with curb used for its moulding, and its body when installed in circuit serves as closing connecting link that closes magnetic flow generated in it.
EFFECT: improved strength characteristics used to erect objects of concrete building structures.
2 cl, 2 dwg, 3 ex
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.