LT3824B - Method for making of laminated walls - Google Patents

Abstract

The main point of the proposed production method of stratified walls is the usage of complex stay-in-place framework building walls of in situ concrete for single-storey and multi-storey buildings. In the application of the proposed method, a precast thin-wall reinforced concrete element together with a layer of thermo-insulation, inside the wall holding a layer spatial reinforcement bar system frame made of temporary metal stiffness rims is fastened to the inner frameworks and therefore carries out functions of the outside framework. After concreting the inner temporary layer of the wall and dismounting inside frameworks and the frame made of temporary metal stiffness rims, the complex stay-in-place framework becomes a protective and heat insulating layer of a wall. Using the proposed method enables to reduce the metal amount required for framework production, construction duration and expenditure of labour.

Description

BACKGROUND OF THE INVENTION The invention relates to the field of construction and can be used for the production of monolithic concrete laminated walls of single-storey and multi-storey buildings.

A known method of constructing monolithic concrete laminated walls is by placing the outer finishing wall layer on specially mounted brackets, attaching the frame to the inner formwork and concreting the inner bearing wall layer (SU No. 863809,1981).

The disadvantage of this method is that installation of the outer layer requires special scaffolding, the design position of the outer wall layer is not guaranteed with respect to the inner formwork, the tight connections hinder the reinforcement of the inner wall layer, resulting in an inefficient double layer wall without thermal insulation.

The closest to the proposed solution in terms of technical solution and achievable result is the production of a laminated wall, where a pre-fabricated outer protective layer, together with the thermal insulation and the metal form in which it is manufactured, is used as an external laminated wall formwork. Once the inner wall layer has been concreted and the concrete has reached its design strength, the metal form and formwork are dismantled (SU 1560707,1990).

According to this method of production, the outer protective layer of concrete, together with the thermal insulation, cannot be separated from the metal form in which it is made, until the complete concreting of the three-layer prefabricated - monolithic wall. I.e. it must be transported and installed together with the metal form. The same shape performs the function of the outer formwork for concreting the inner layer and cannot be removed until the inner layer concrete has reached the design strength. All this reduces the turnover of metal forms, increases metal costs and product weight, and significantly increases construction costs. In addition, the chaotically arranged gussets prevent the reinforcement bars of the inner wall layer from forming.

The object of the invention is to reduce the amount of metal for the production of formwork, construction time and labor costs. The aim is achieved by using a prefabricated thin-walled reinforced concrete element for the production of laminated walls, which, together with the thermal insulation layer and reinforcing bars of the inner bearing layer of the wall, is fixed to the inner wall formwork by a frame of temporary metal stiffeners. After concreting the wall support layer, the inner formwork and frame are removed from the temporary metal stiffeners and the residual formwork becomes the outer protective layer of the wall.

The first figure shows a prefabricated thin-walled reinforced concrete element, together with a thermo-insulating layer and a spatial reinforcing bar of the inner bearing layer of the wall, attached to the frame by temporary metal stiffeners.

The second figure shows the assembly “A” of the pre-fabricated reinforced concrete element to the frame from the temporary stiffeners.

The third figure shows a prefabricated thin-walled reinforced concrete element, together with a heat-insulating layer and a reinforcing bar frame of the inner bearing layer of the wall, attached to the inner formwork by the temporary metal stiffeners.

The fourth figure shows a fragment of a three-layer wall, where a precast thin-walled reinforced concrete element serves as the outer protective layer of the wall.

The layered wall of monolithic concrete consists of a prefabricated thin-walled reinforced concrete element - outer protective wall layer 1, thermal insulation layer 2 and inner bearing layer 3. Wall outer protective layer 1 and inner bearing layer 3, reinforced with spatial reinforcement bar 4, connected by gussets 5.

The order of execution of the proposed method of manufacturing laminated walls is as follows:

The pre-fabricated thin-walled reinforced concrete element 1 is fitted with a thermo-insulating layer 2 and a reinforcing bar 4 for the inner bearing layer of the wall by means of slotted connections 5. The thin-walled reinforced concrete element 1 a frame of temporary metal stiffeners 6. The fastening means are used for fastening the temporary studs 7, the nut 8 with the handle 8, the mounting loops 9 of the element 1 and the latch 12 of the screw hoist 11 of the frame of the temporary stiffeners 6 with a removable pin 13. 5, together with the frame from the temporary metal stiffeners 6 and the reinforcing bar 4, is raised to the design position and fixed to the bracket 16 of the inner formwork 14 mounted on the slab 15 by means of screw lifts 11 and 17 to adjust the 1, 2, 5 p. projecting position. Unscrewing temporary templates 7, removable nuts with handle 8 and residual formwork 1, 2, 5, which together with the frame from the temporary metal stiffening edges 6 serve as outer formwork, fasten the templates 18 with tapered sleeves 19 to the inner formwork 14. inner bearing layer 3. After hardening of the concrete inner bearing layer 3, the formwork is dismantled in the following order: unscrewing tongues 18, removable pins 13, removable frame from temporary metal stiffeners 6, demountable inner formwork 14, removable conical bushes 19, thermo-insulating plugs holes to be repaired.

The application of the invention can reduce the amount of metal for the production of formwork, since the outer metal shields of the formwork are unnecessary. Reduces labor costs and time on site during preparation for concreting and dismantling of pavements, and installation of spatial reinforcing bars for the inner wall of the wall.

This method is suitable for concreting walls at negative outdoor temperatures because the complex residual formwork is insulated.

The working conditions of the bearing concrete and outer protective reinforced concrete layers of prefabricated-monolithic walls are improved, because the freely deformable, prefabricated outer protective layer with thermal insulation protects the inner bearing layer from the influence of external temperature and humidity. This prevents the formation of cracks in both the inner and outer wall layers.

Claims (2)

1. A method of fabricating laminated walls, comprising attaching exterior residuals with a thermal insulation layer to prefabricated interior formwork, reinforcing products, concreting the inner wall of the wall and dismantling the inner formwork, characterized in that the precast thin-walled reinforced concrete terrnoizoliacinių layer is fixed to the frame of the temporary metal stiffeners assembled building to the design position and approved _v · on the ceiling and, užbetonavus retaining wall layer from the temporary frame demontuoja metal stiffener and inner floors. 2. A method of manufacturing a sandwich wall according to claim 1, characterized in that the spatial reinforcement bar of the inner bearing layer of the wall is attached to the prefabricated thin-walled reinforced concrete element together with the thermal insulation layer before being placed in the design position of the inner formwork.