RU2136827C1 - Method for erection of three-span structure with pneumatic shuttering - Google Patents

Abstract

FIELD: construction engineering. SUBSTANCE: method can be used in erection of monolithic structures by means of pneumatic shuttering. According to method, pneumatic shuttering is secured on horizontal base, walls are concreted, concrete is cured until it acquires preset strength, pivoted structures are attached to lower and upper parts of walls. After that, concrete mix is placed on pneumatic shuttering and shuttering is lifted to design position. At this operation, walls together with pivoted structures take their design position. Design of reinforced concrete walls with pivoted structures allows for installing walls not strictly vertical which adds to better functioning of building structure. Application of aforesaid method increases useful floor area of structures and requires less labour. EFFECT: higher efficiency. 3 dwg

Description

 The invention relates to the construction and can be used in the construction of monolithic structures for various purposes using pneumatic formwork.

 A known method of construction of reinforced concrete structures and.with. N 1054529 C. E 04 G 21/14 1983, which consists in laying reinforced concrete panels (or concreting the latter in place) onto non-inflated pneumatic formwork, articulated together along faces parallel to the longitudinal axis of the pneumatic formwork, lifting the structure by inflating the pneumatic formwork. At the same time, in order to ensure the possibility of lifting walls whose height is more than 1/4 of the span, a central articulated joint of the coating is loaded when lifting.

 The disadvantage of this method is the use of a rather cumbersome system of cords, which complicates the design and increases the complexity of the construction.

 Closest to the proposed technical essence and the achieved result is a method of erecting monolithic structures in pneumatic formwork according to as N 850844 C. E 04 G 11/04 1981

It is selected as the closest analogue. The essence of the construction of structures according to this method is to secure non-inflated pneumatic formwork on a horizontal base, concrete walls, keeping concrete to a set strength, laying concrete mixture on pneumatic formwork, raising the formwork in the design position, while trying to increase the height of the walls of the structure, the walls are lifted by lifting mechanisms hang the adjacent sections of the arch on the walls above the pneumatic formwork, pivotally attach the bottom of the walls to the foundations, and then disconnect the walls about lifting mechanisms. To avoid sliding of the concrete mixture from the suspended sections, their angle of inclination to the horizon can withstand less than 50 ^o .

 However, this method of construction of structures requires the use of lifting mechanisms of at least two, and simultaneously on both sides of the structure. In addition, in the suspended sections of the arch adjacent to the walls, the concrete mix fails, which leads to the need for additional formwork in these areas from below. All this has a significant impact on the cost of construction and increasing the complexity of work.

 To avoid these drawbacks, a method is possible in which, when erecting monolithic structures on a pneumatic formwork, the pneumatic formwork is fixed on a horizontal base, the walls are concreted, concrete is kept to set strength, the hinged structures are fixed to the lower and upper parts of the walls, concrete formwork is laid on the pneumatic formwork, and the pneumatic formwork is raised in design position, pulling the walls to the design position and hinging the bottom of the walls to the foundations, while walls with hinged structures s also take their design position, forming two additional span for erecting buildings.

 The hinged structures used allow not to set the walls strictly vertically, using load-lifting mechanisms, and this, in turn, contributes to a better work of the building structure (cross section - rational arch) and increases the useful area of the building due to the formation of two additional spans on both sides of it.

 In the proposed method, it is new that, after concreting the walls and keeping the concrete to a set strength, the hinged structures are fixed to the lower and upper parts of the walls, which, after raising the pneumatic formwork to the design position, increase the area of the structure.

 The specified feature is not identified from the existing level of technology, which allows us to conclude that the criterion of "inventive step".

 In FIG. 1 shows a pneumatic formwork before lifting to the design position (plan view); figure 2 is the same in section; figure 3 is a transverse section after lifting the structure in the design position.

 On the foundations 1 laid non-inflated cylindrical pneumatic formwork 2, attached to the base by fasteners 3, and reinforced concrete walls 4 are made, between which the main part of the coating of the structure 5 is located.

 Hinged structures 6 are attached to the lower and upper parts of the walls, which consist of rods 7, 8, 9 constituting flat frames, and rods 10, 11 connecting these frames to three-dimensional structures.

 Between the rods 9, 11 and the supposed top of the wall 4 along the building, fillings 12 of light material can be made, which in the design position will serve as a cover for two additional spans of the structure.

 Monolithic reinforced concrete structures are constructed as follows.

 First, reinforced concrete walls 4 are concreted on a soft, non-inflated cylindrical pneumatic formwork 2 attached to the base using mounting devices 3, maintained until concrete has set the specified strength, then hinged structures consisting of rods 7, 8, 9, 10, are fixed to the bottom and top of the walls eleven.

 In the main part of the coating 5 is laid concrete mixture. Prior to setting concrete mixture, air is supplied under pressure to the pneumatic formwork 2, it is inflated, arching the coating 5 and pulling the walls 4 to the foundations 1.

 The configuration of the reinforced concrete walls 4 allows you to not set them strictly vertically, which contributes to the formation of the supporting structure of the structure (cross section) of the non-momentary arch. In addition, the span of the structure is increased by 1.5-2 times compared with traditional methods of erection of structures (for example, according to A. S. N 850844 class E 04 G 11/04 1981) due to the use of hinged structures 6.

 Structures can be erected with cladding, insulation and waterproofing, performed before concreting the walls and the main coating area.

 This method is industrially applicable.

Claims (1)

 A method of erecting monolithic structures on a pneumatic formwork, including fixing the pneumatic formwork on a horizontal base, concreting walls, keeping concrete to a set strength, laying concrete mix on pneumatic formwork, raising the formwork to the design position, pulling the walls to the design position, hinging the bottom of the walls to the foundations and subsequent sealing of joints, characterized in that after concreting the walls and keeping the concrete to a set strength set to fix izhney and upper parts of the walls of the hinge structures.

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