RU178930U1 - REINFORCED CONCRETE WALL-FREE WALL FORMWORK - Google Patents

Abstract

The utility model relates to the field of construction, namely to fixed wall formwork and can be used for the construction of external precast-monolithic walls of basements and buried floors, industrial and civil buildings and structures. Fixed reinforced concrete wall formwork, consisting of two thin-walled flat reinforced concrete slabs, one of which is molded later than the other, connected by a spatial reinforcing frame, the lower and upper belts of which are located in the concrete of the slabs, characterized in that to the slab formed later along its inner vertical edges of a rigidly mounted waterproofing key made of elastic material. The technical result of the utility model is to ensure the tightness of the vertical technological joint of concreting while maintaining the bearing capacity of the precast-monolithic wall and, as a result, the possibility of using such formwork for the construction of external precast-monolithic walls of basements and buried floors of industrial and civil buildings.

Description

The utility model relates to the field of construction, namely to fixed wall formwork and can be used for the construction of external prefabricated monolithic walls of basements and buried floors of industrial and civil buildings and structures.

Known reinforced concrete fixed wall formwork for the construction of prefabricated monolithic walls [1] in the form of a thin-walled reinforced concrete slab with a smooth outer and rough inner surfaces containing a spatial reinforcing frame in which one of the belts is located in the concrete slab.

Signs of an analogue that coincide with the essential features of the claimed utility model - the formwork is made in the form of flat reinforced concrete slabs.

The lack of construction of this formwork should be considered as the tightness of the vertical technological joints of concreting located on the border of the grips, due to the low adhesion between the concrete of the adjacent grips due to the different time of their concreting.

The closest in technical essence to the claimed design is the structural solution of the reinforced concrete fixed wall formwork (reinforced concrete element of the fixed formwork with the supporting reinforcing frame "Filigran" for prefabricated monolithic walls), selected as a prototype [2], containing two thin-walled flat reinforced concrete slabs, one of which is molded later than the other, connected by a spatial reinforcing cage, the lower and upper zones of which are located in concrete slabs.

Signs of the prototype that coincide with the essential features of the claimed utility model are formwork containing two thin-walled flat reinforced concrete slabs, one of which is molded later than the other, connected by a spatial reinforcing cage, the lower and upper belts of which are located in the concrete of the slabs.

The disadvantage of the prototype is the lack of a constructive solution that ensures the integrity of the vertical technological joint of concrete, while maintaining the bearing capacity of the precast-monolithic wall and, as a consequence, the unsuitability of using this formwork for the construction of external precast-monolithic walls of basements and buried floors of industrial and civil buildings and structures .

The objective of the utility model is to develop a constructive solution for reinforced concrete fixed wall formwork, ensuring the tightness of the vertical technological joint of concrete, while maintaining the bearing capacity of the precast-monolithic wall, and as a result, the possibility of using such formwork for the construction of external precast-monolithic walls of basements and buried floors of industrial and civil buildings and structures.

This problem is solved due to the fact that in the formwork, which consists of two thin-walled flat reinforced concrete slabs, one of which is molded later than the other, connected by a spatial reinforcing frame, the lower and upper belts of which are located in the concrete of the slabs, to the slab formed later along its internal vertical edge, a waterproofing key made of elastic material is rigidly mounted

The utility model is illustrated by the image. In FIG. 1 is an axonometric view of the formwork.

Reinforced concrete fixed wall formwork consists of two thin-walled flat reinforced concrete slabs, one 1 of which is molded later than the other 2, connected by a spatial reinforcing cage 3, the lower and upper belts of which are located in the concrete of the slabs. Along the inner vertical edge 4 of the plate 1, a waterproofing key 5 of elastic material is rigidly mounted.

The authors found that in the manufacture of fixed reinforced concrete formwork, cement milk on its inner surfaces forms a continuous film. According to the manufacturing technology, one of the plates, molded earlier, is in the curing chamber for at least two days, and the other, molded later, is at least one day. This leads to the fact that the adhesion between the prefabricated formwork plates and the monolithic layer is heterogeneous: for the plate molded earlier, the specific adhesion is higher than for the plate molded later. Therefore, in the case of the use of this fixed formwork for the construction of the outer walls of basements and buried floors of buildings, it must be oriented so that the slab molded later is on the outside of the precast-monolithic wall, i.e. from the ground, and thus performed, basically, the function of a protective fence. The function of the supporting structure is provided by a previously molded plate and a monolithic layer. Construction practice shows that even with external waterproofing of a precast wall, water often seeps into the premises through vertical technological seams. To increase their tightness, it is necessary to provide for additional measures, for example, installation of waterproofing dowels of elastic material in the seams. It follows that to ensure the tightness of the vertical technological concreting joint, while maintaining the bearing capacity of the precast wall, the waterproofing key should be rigidly mounted along the internal vertical edge of the slab formed later.

The proposed constructive solution of reinforced concrete fixed wall formwork ensures the tightness of the vertical technological joint of concreting while maintaining the bearing capacity of the precast-monolithic wall and, as a result, the possibility of using such formwork for the construction of external precast-monolithic walls of basements and buried floors of industrial and civil buildings and structures, which is technical result.

List of references

1. Matskevich A.F. Fixed formwork of monolithic reinforced concrete structures. - M.: Stroyizdat, 1986 .-- 96 s.

2. STO NOSTROY 2.6.15-2011 “Prefabricated monolithic reinforced concrete structures. Elements are prefabricated reinforced concrete walls and floors with spatial reinforcing cage. Technical conditions. " - M.: NIIZHB, Publishing House "BST", 2011. - 42 p.

Claims (1)

Fixed reinforced concrete wall formwork, consisting of two thin-walled flat reinforced concrete slabs, one of which is molded later than the other, connected by a spatial reinforcing frame, the lower and upper belts of which are located in the concrete of the slabs, characterized in that to the slab formed later along its inner vertical edges of a rigidly mounted waterproofing key made of elastic material.

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