RU2647521C1 - Method of manufacture of continuous plate foundations of box section from ribbed plates of overlapping - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method of manufacture of continuous plate foundations of box section from ribbed slabs of overlapping includes the separate production of lower and upper slabs with concrete holding up to a set of carrier strength. Prefabricated monolithic slabs of foundations are formed from ribbed slabs, which are installed on the previously prepared surface with stiffening ribs upwards with a gap and are joined together by welding with clamping fittings. After welding, the gap between the slabs and the clamping fittings are homogenized. For making top of reinforced concrete slab, internal surface of box is covered with sand or clay, tamped, ribs top is reinforced with steel mesh and the top slab of cement-sand mortar or fine-grained concrete is put.

EFFECT: improvement of processability of the construction works, through the use of ribbed slabs of factory manufacturing, reducing material intensity of foundation, labour intensity and timing of its manufacture.

3 cl, 6 dwg, 1 ex

Description

The invention relates to the construction and can be used in the manufacture of continuous slab foundations of the box section of shallow laying.

Known ribbed floor slabs of factory manufacture, which are part of the construction of prefabricated floors, which are used as floors (coatings) of buildings [Evstifeev V.G. Reinforced concrete and stone structures. At 2 hours. Part 1. Reinforced concrete structures: a textbook for students. institutions of higher prof. education / V.G. Evstifeev. - M.: Publishing Center "Academy", 2011. - S. 291-293]. The closest in its features adopted for the prototype is a method of manufacturing a solid foundation of a box-shaped (frame) section, consisting of upper and lower plates and a system of transverse and longitudinal ribs (diaphragms) [Evstifeev V.G. Reinforced concrete and stone structures. At 2 hours. Part 1. Reinforced concrete structures: a textbook for students. institutions of higher prof. education / V.G. Evstifeev. - M.: Publishing Center "Academy", 2011. - S. 406-407]. The disadvantages of this method are: the duration of manufacture with the installation of expensive formwork, separate formation in 3 stages: 1 - the bottom plate, 2 - the walls and 3 - the top plate with concrete exposure at each stage until the set formwork strength is set, high laboriousness and cost.

The objective of the invention is to increase the manufacturability of construction works through the use of factory-made ribbed plates, reducing the cost of the foundation, the timing of its manufacture, improving the quality of work performed, and reducing material consumption.

The invention is depicted in figures 1-6. The figure 1 shows the conjugation of ribbed plates laid with the ribs up, in figure 2, 3 - the construction of a continuous slab foundation of box-section from conjugated ribbed plates laid up by the edges, in figure 4 - top view of the slab foundation of box-section of conjugated ribbed plates laid in the ribs up, in figure 5 - a mesh of reinforced steel, fixed by welding to bare reinforcement in the edges of the plates, in figure 6 - steel mesh.

A method of manufacturing continuous box-shaped foundation foundations of box-shaped sections from ribbed floor slabs includes compacted soil, waterproofing, ribbed slabs, compacted sand, insulation in a plastic film, cement-sand screed from fine-grained concrete, transverse reinforcement, wire for strapping reinforcement, wire mesh made of reinforced steel along the transverse ribs.

The proposed method is implemented as follows: the construction site is marked and leveled, the soil is removed to the calculated depth to reliable foundation soils and compacted, waterproofing is carried out with polyethylene film, which is filled with sand to a thickness of 5-20 cm, they are laid on the sand using crane equipment with ribs rigidity up ribbed plates that are interconnected by welding of clamping embedded parts, the bottom of the resulting box is filled up by 10-15 cm if necessary (or for all the thickness of the slab) with sand or clay, a plastic film is laid in which the insulation is wrapped, a steel mesh is laid on it to create a reinforcing concrete frame along the top of the ribs and is welded to the exposed reinforcement in the edges of the plates, then a screed is filled to a height of 5-8 cm with cement mortar or fine concrete.

An example of the method

During the construction process on steep slopes, in order to exclude the possibility of a landslide or at a high level of groundwater occurrence during the construction of the foundation, a method for manufacturing continuous box-shaped foundation foundations from ribbed floor slabs was proposed, which was implemented in the following sequence: the construction site was marked and leveled, the soil was dug out to the calculated depth to the foundation of reliable soils, compaction was performed, waterproofing made of plastic film was laid, covered with sand to a thickness of 5-20 s m and rammed. Then, with the help of crane equipment, ribbed slabs were laid on compacted sand with a gap upwards and connected by welding with tie-in embedded parts. After welding, the gap between the plates and the tie-in parts were monolithic, the bottom of the box was covered with sand to a thickness of 10-15 cm, a plastic film with insulation was laid, to create a reinforcing concrete frame of the upper plate, a mesh was laid on top of the insulation on the insulation, which was welded to the reinforcement in the ribs slabs, then a screed was created to a thickness of 5-8 cm, which was made of fine-grained concrete.

This method of manufacturing continuous slab foundations of a box-shaped section from ribbed floor slabs made it possible to exclude soil slipping on a slope and to slow down the frost heap of soils.

Using the proposed technical solution allows you to:

- Dispose of ribbed slabs that were in operation that have defects, cracks, chips, corrosion of reinforcing steel, assembled after dismantling of industrial facilities, manufactured in the factory, which will ensure high productivity and quality of work performed in summer and winter;

- sharply reduce the time for the manufacture of foundations (from 3 days);

- sharply reduce the cost of manufacturing precast-monolithic slab foundations through the use of used reinforced concrete slabs;

- reduce the mass of the foundations;

- save cement concrete;

- to improve the quality of work due to the use of factory-made plates, the lack of the need to install expensive formwork and highly qualified specialists at the construction site;

- solve the environmental problems of recycling reinforced concrete slabs during the demolition of buildings and structures.

Claims (3)

1. A method of manufacturing continuous slab foundations of a box-shaped section from ribbed floor slabs, including the separate manufacture of the lower and upper slabs with concrete exposure to a set of formwork strengths, characterized in that prefabricated monolithic slabs of the foundations are formed from ribbed slabs that are mounted on a prepared surface with ribs stiffnesses up with a gap and are connected together by welding with clamping embedded parts, after welding, the gap between the plates and coupling clamping parts is monochromatic, and for the manufacture of the upper reinforced concrete slab, the inner surface of the box is covered with sand or clay, tamped, the top of the ribs reinforced with steel mesh and the upper slab of cement-sand mortar or fine-grained concrete is laid. 2. The method according to p. 1, characterized in that the bottom of the box is covered with sand or clay to a thickness of 10-15 cm 3. The method according to p. 1, characterized in that the screed of fine concrete is laid on a thickness of 5-8 cm

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