Currently, construction elements are mainly produced by in site pouring of concrete into concrete forms or by assembling of prefabricated reinforced concrete elements. These applications raise the demand for different types of concrete forms. There are several requirements these concrete forms must satisfy: they must be durable and light, allow easy assembling and disassembling, repeated use, handling and assembling/disassembling without the use of hoisting machinery and have low cost and metal consumption. The latter requirement provides also for a light weight of the concrete form.

Furthermore, monolithic structural elements produced by pouring the concrete into such concrete forms must require minimum additional finishing.

Known is adjustable concrete form panel (SU Inventor's Certificate N° 1300127) comprising a framework, a deck and bearing elements in the form of stanchions attached to said framework and extending beyond the upper and bottom edges of the deck.

Also known is concrete form panel (RU Patent #2038975) comprising a frame the surface of which is made of metal, plywood or plastic, and a bearing element with transverse plates installed at one side of said frame.

Disadvantages of these technical solutions are the complexity and subsequent high time consumption of concrete form assembling, and also high metal consumption.

Known is concrete form panel (RU Patent N° 2128762) with a peripheral flat framework at one side of it.

Disadvantages of this solution are the complexity of form assembling and loss of laitance through gaps between the panels.

One objective of this invention is to provide a concrete form panel for monolithic construction elements used in the construction by in site concrete pouring or by assembling prefabricated elements, preferably, support elements, that can be rapidly and easily assembled without additional machinery for the construction of vertical, horizontal or slanted construction elements in buildings of any types.

Another objective of this invention is to provide a light multipurpose frame that can be used in the assembling of new types of concrete forms.

The objectives of this invention are accomplished by using the frame described below. The frame of the panel concrete forms according to this invention is made of an aluminum alloy and comprises three flat elements two of which are parallel to each other and perpendicular to a third element, said two former parallel elements having equal length. The cross-section of the frame is rectangular in shape, three sides of said rectangle being formed by said three elements, and one longer side of said rectangle that connects said two parallel equal-length sides has a cavity in the form of a right angle with equal perpendicular sides, this cavity being shifted from the middle of said longer side towards a shorter rectangle side and oriented towards the other longer side of the frame. The second longer side of said frame has a slotted recess on its outer side, the length of which slotted recess is not larger than the length of the longer inner side of the frame. The same longer side of said frame has an flange oriented along said longer side, the thickness of said flange being equal to the thickness of the elongated side said flange is located on.

In the preferable embodiment of this invention, the length of said flange is 20 + 1.00 mm, the length of the longer side is 120 1. 1 mm, the length of the shorter side is 60 0.8 mm, the length of the slotted recess is 95 + 9.5 mm, the depth of the slotted recess is 1.5 0.15 mm, and the end of the slotted recess is 30 3 mm away from the distant end of the flange. Basically, the thickness of said flange and the thickness of the elongated side that carries this flange is 60.5 0.35 mm, the thickness of other elements of the frame being 5 0.35 mm.

These sizes, as well as the length of the frame, depend on its specific purpose.

In the preferred embodiment of this invention the panel of the concrete forms made using the frame as described above is rectangular in shape and at one side of it there is a framework made of frames as described above, hereinafter referred to as first type frames. At least three second type frames are placed between two parallel first type frames. Basically, second type frames are parallel one to another and at equal distances between them. In the preferred embodiment of this invention the frames are joined by welding, however, joining with angle bars attached to said frames with threaded joints is also possible.

The second type frame is also made of the aluminum alloy and its cross-section is H-shaped, the edges of one of its parallel elements, preferably having a width of 90-110 mm, have first supports, preferably having a height of 10-20 mm, that are parallel to the element that connects said parallel elements of said H-shaped frame, and the edges of the other of its parallel elements, preferably having a width of 35-45 mm, have second supports that are parallel to said first supports and oriented in the same direction. The ends of said second supports are twice bent at right angles in the opposite direction such that the end faces of said second supports are oriented towards the ends of said first supports. The height of said end faces of said second supports is equal to the height of said first supports, and the width of the second one of the parallel elements in the H-structure of the frame is 35-45 mm and is equal to the length of the second supports to the first right angle bent. The concrete form panel can be made of any material not adhesive to concrete, e. g. plywood, aluminum sheets, vinyl plastic sheets etc.. The thickness of the concrete form panel is determined on the basis of the strength of the material used.

Additionally, between said parallel end elements of the second type frame and parallel to the to said first type frames, third type frames with a rectangular cross-section can be installed, preferably, parallel to said first and second type frames. In the preferable embodiment of this invention, between said third type frames and said first type frames adjacent thereto, at least two elements made of said third type frames can be installed perpendicular to said first and second type frames.

Further additionally, at least two of the angles formed by said first type frames, preferably, two diagonally positioned angles of the panel, may be equipped with a joining element made of said third type frames and attached to said first type frames.

This invention will be described in detail below in conjunction with the attached drawings, wherein Figure 1 is a cross-sectional view of a first type frame, Figure 2 is a cross-sectional view of a second type frame, Figure 3 is a cross-sectional view of a third type frame, Figure 4 is an illustrative embodiment of the concrete form panel made of first and second type frames, Figure 5 is an illustrative embodiment of the concrete form panel made of first, second and third type frames, and Figure 6 is an illustrative embodiment of the concrete form panel made of first and second type frames and having angular joints made of third type frames.

In Figure 1,1 is the longer side of the frame, 2 is the shorter side of the frame, 3 is the flange, 4 is the slotted recess and 5 is the right- angle cavity. In Figure 2,6 is the first parallel element of the frame section, 7 is the second parallel element of the frame section, 8 is the element that connects said parallel elements, 9 are the first supports and 10 are the second supports. In Figure 4,11 is the panel deck, 12 are the first type profiles and 13 are the second type profiles. In Figure 5,11 is the panel deck, 12 are the first type profiles, 13 are the second type profiles and 14 are the third type profiles. In Figure 6,11 is the panel deck, 12 are the first type profiles, 13 are the second type profiles and 14 are the third type profiles.

When concrete form panels are used in the construction of vertical or slanted monolithic construction elements, concrete form panels made to any of the above variants and joined with any known method are positioned in at least one stack of two rows, elements that adjust the distance between the panels are installed between them, and finally panel supporting elements and scaffolds are installed at their outer side. In the preferred embodiment of this invention, reinforcement is placed into such concrete forms and concrete is poured therein. When the concrete has hardened the concrete forms are disassembled.

When concrete form panels are used in the construction of floors, concrete form panels made to any of the above variants and joined with any known method are positioned at the level of the floor to be made, secured with any known method in the desired position, and, in the preferred embodiment of this invention, reinforcement is placed into such concrete forms and concrete is poured therein. When the concrete has hardened the concrete forms are disassembled.

The use of concrete form panels reduces the cost of concrete form installation and securing, lowers the loss of laitance due to a more uniform and closer contact between the panels, and simplifies the process of assembling, disassembling and handling of the concrete forms.

Said result is achieved by using the frame as described below. The frame of the panel concrete forms is made of an aluminum alloy and comprises three flat elements two of which are parallel to each other and perpendicular to a third element, said two former parallel elements having equal length. The cross-section of the frame is rectangular in shape, three sides of said rectangle being formed by said three elements, and one longer side of said rectangle that connects said two parallel equal-length sides has a cavity in the form of a right angle with equal perpendicular sides, this cavity being shifted from the middle of said longer side towards a shorter rectangle side and oriented towards the other longer side of the frame. The second longer side of said frame has a slotted recess on its outer side, the length of which slotted recess is not larger than the length of the longer inner side of the frame. The same longer side of said frame has an flange oriented along said longer side, the thickness of said flange being equal to the thickness of the elongated side said flange is located on.

In the preferable embodiment of this invention, the length of said flange is 20 1.00 mm, the length of the longer side is 120 i 1. 1 mm, the length of the shorter side is 60 0.8 mm, the length of the slotted recess is 95 9.5 mm, the depth of the slotted recess is 1.5 0.15 mm, and the end of the slotted recess is 30 i 3 mm away from the distant end of the flange. Basically, the thickness of said flange and the thickness of the elongated side that carries this flange is 60.5 i 0.35 mm, the thickness of other elements of the frame being 5 0. 35 mm.

These sizes, as well as the length of the frame, depend on its specific purpose.

The concrete forms according to this invention are not inferior to any of the known steel frame concrete forms and withstand high dynamic and static loads (at least 14 tons/sq. m), combined with high rigidity parameters (at least 1: 500).