Thermoform for the manufacture of prestressed concrete products
(57) Abstract:Usage: in the building materials industry, in particular for the manufacture of prestressed concrete products in thermoformed. The essence of the invention: termoform pallet contains and boards made with heat compartments and compartments for refrigerant, cap, valve, installed in the slots of the lugs, the input and output pipes. While the pallet and the boards have additional compartments for refrigerant communicating with the main and adjacent to the other side of thermal compartments. Cover is made with a compartment for refrigerant communicating with compartments for refrigerant sides and base, and is supplied mounted on the output gear compartment and the outlet pipe. In the limit valve removable secured to the ends of the pallet and longitudinal sides. 4 Il. The invention relates to the construction materials industry, in particular for the manufacture of prestressed concrete products in thermoformed.Closest to the technical nature of the proposed line is termoform for the manufacture of prestressed concrete products, including pallets and boards made with heat which run in the grooves of the lugs, posted in the form, and input and output connections for the coolant and refrigerant 
The disadvantage of this device is uneven heating of the concrete section and they are not provided the specified mode of heat treatment of concrete.The objective of the invention is the provision of a given mode of heat treatment of concrete.This task is solved in that in thermoformed for the manufacture of prestressed concrete products, including pallets and boards made with heat compartments for the refrigerant, the cover, the actuator with anchors at the ends inserted in the slots of the lugs placed in the form, and input and output connections for the coolant and refrigerant, the pallet and the side is made with extra compartments for the refrigerant, connected with the main and adjacent to the other side of thermal compartments, and cover is made for storing refrigerant, communicating with compartments for refrigerant sides and base and is supplied mounted on the outlet compartment, gear outlet pipe, the valve stops removable secured to the ends of the pallet and longitudinal sides.In Fig.1 shows termoform, type in the plan without a cover; Fig.2 section a-a in Fig.1; Fig.3 2, having input and output connections for coolant T, respectively 3, 4 and 5, 6.On the ends of thermoform are power lugs 7, resting on the ends of the sides 1 and tray 2 and having grooves for installation with anchors at the ends of the working armature 8 concrete products 9.On the pallet 2 fixed fixed 10 and the movable end 11 side with grooves for reinforcement 8. On the one hand end of the stop 7 is connected with a direct pipeline to the reservoir 12 for refrigerant X (air) inlet and outlet pipes, respectively, to the sides 13 and 14 and the pallet 15 and 16. While the outlet 16 of the pallet is located on the fixed Board 10 provided with the first.In turn, the Board 1 and the tray 2 is made in the cross section (Fig.2 4) of the main heat compartments, respectively, 17 and 18 for the carrier T and the extra internal and external compartments, respectively, 19 and 20 and 21 and 22 for refrigerant H. additional internal compartments boards and pallet 19 and 21 together with the front sides 10 and 11 form form concrete products 9 and additional exterior compartments thermally insulated.Compartments 19,20,21 and 22 are communicated with each other (Fig.1 3) and with the compartment 23 of the cover 24, and is 16 for refrigerant X is made, for example, a cone with wearing them elastic covers 28 (Fig.4) made of heat-resistant rubber or paronite.In turn, places the passage in the cover 24 of the nozzle 14 and thence compartment 23 has a socket 29 which, when the cover 24 is in the design position will provide sealing compounds all compartments for refrigerant.The presented figures are not shown gasket or additional details to ensure sealing of the gap where it passes the valve 8 through the end of termonorte 10 and 11, a lock for securing the lid 24 to thermoburn 1, 10, 11 and the insulation of the collector 12.Structurally additional internal and external termodeck for refrigerant should not impede thermal elongation of power termodeck for coolant, for example, they may be slightly shorter than the last, and so onThe device operates as follows.Originally open termonorte 1, 11 (Fig.1), grease the formwork surface and position the Board 11, close to thermoform. The ends of the sides 1 and tray 2 fixed power lugs 7, the grooves of which the end flanges 10 and 11 firmly establish armature 8 with anchors at the ends. On the places of passage of the valve 8.At this preliminary stage of manufacture of the first group thermoform finish.The tension of the valve 6 is carried out by a continuous supply of high-temperature heat carrier (T 250 300o(C) in the heating compartments 17 and 18 boards 1 and tray 2 and further linear thermal expansion of the latter. At the end of the tension reinforcement carry out laying and compacting concrete in the received form concrete products 9. Next, close thermoform cover 24, so that the output pipes of the refrigerant sides 14 and tray 16 went into the hole with the socket 29 of the compartment lid 23. Then the cover 24 is pressed tightly against the upper surface of the concrete products 9, fixing locks to the sides 1.The inclusion of the circulation system coolant, start the period of rise of the temperature of heat treatment of concrete. Refrigerant (air) at this stage passes through a heater and then into the reservoir 12 termoform, where the input to the nozzles 13 of the flanges 1 and 15, the pallet 2 refrigerant enters first additional exterior compartments 20 and 22, having received heat from one side of the compartment 17 and 18, enters additional internal compartments 19 and 21. Taking extra warmth on the other side of the compartment, hlada the derivative of the nozzles 14 and 16 into the compartment 23 of the cover 24 and heats thereby the upper surface of the concrete products 9. Gear 25 regulate the speed of the refrigerant from the compartment 23 and, thereby, maintain a specific mode of heat treatment of concrete thermoformed, regardless of the item manufactured prestressed concrete products.The heat treatment is carried out before the start of the cooling-off period of heat treatment of concrete when required a continuous flow of high temperature fluid into the compartments 17 and 18 to provide the required pre-tension in the reinforcement 8.Upon completion of the heat treatment of concrete (the start of the cooling mode), the flow temperature of the heat carrier in the heating compartments stopped and, simultaneously, the system of circulation of the refrigerant is transferred to the cooling mode, i.e., in the primary and secondary compartments served chilled as the coolant and the refrigerant.During cooling thermoform it is shortening, and thus is a smooth vacation all that hard rods 8 on concrete products 9. Then cut off the circulation system of the cooling fluid and coolant, open the cover 24 and the flanges 1, 11, are required valve 8 and the finished prestressed product transport times on the cart export products.the meet place saving labor and material costs by eliminating expensive equipment for tension reinforcement. The energy of the fluid is used both for tension reinforcement, heat treatment of concrete, and to create a smooth vacation tense reinforcement for concrete.2. Design termodeck cover with gear on the output allows you to get in thermoformed different modes of heat treatment of concrete due to the change speed of the output of the refrigerant. Thus the conditions for production in one group thermoform of concrete products for various items, greatly expanding the technological capabilities of the line.3. The presence in the design of the boards and pallet additional internal and external termodeck located on both sides of the main termodeck, provides for tension reinforcement and heat treatment of concrete, his uniform heating across the section and, as a consequence, the set of linear thermal elongation, thus enhancing the quality of pre-tension. In addition, due to the passage of refrigerant from two sides of the main termodeck increased removal of heat from its walls and provides the specified mode of heat treatment of concrete. Thermoform for the manufacture of prestressed concrete products, VK is NTA, cover the valve with anchors at the ends inserted in the slots of the lugs placed in the form, and input and output connections for the coolant and refrigerant, characterized in that the base and the sides are made with extra compartments for the refrigerant, connected with the main and adjacent to the other side of thermal compartments, and cover is made with a compartment for refrigerant communicating with compartments for refrigerant sides and base, and is supplied mounted on the output gear compartment and the outlet pipe, the valve stops the pickup attached to the ends of the pallet and longitudinal sides.
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.