SU1756493A1 - Building frame - Google Patents

Abstract

Use: for the construction of buildings for housing and civil and industrial use. SUMMARY OF THE INVENTION 1 In the framework of the building, the reinforcement of one of the directions is made in the form of rigid profiles 4 with vertical walls installed with gaps 8 relative to columns 1, and the reinforcement of the other direction 4 is passed through holes formed in the walls of the profiles parallel to the outer edges of the columns and rigidly composed profiles 3 in places of admission, at the same time the concrete is made self-pulling. 5 il.

Description

Fig.i

The invention relates to building structures and can be used in the construction of residential buildings for industrial purposes.

The purpose of the invention is to increase the carrying capacity while reducing labor costs during installation

FIG. 1 shows a fragment of the building framework, plan; in fig. 2 shows section A-A in FIG. one; FIG. 3 is a node. FIG. 1, FIG. 4 shows a section BB in FIG. 3; in fig. 5 - assembly diagram of the construction of the frame.

The skeleton of the building consists of a column 1 and a slab which is integrally connected to them. 2 Columns 1 can be made of reinforced concrete or steel. The slab 2 consists of prestressed reinforcement, dividing the ceiling into cells, and self-stressing concrete. The slab is reinforced in two perpendicular directions. The armature of one of the directions is made in the form of rigid profiles 3 with a vertical wall, and the armature of the other direction is made in the form of rods 4 passed through holes formed in the walls of the profiles 3 parallel to the outer face of the columns.

In the places of mutual intersection, the profiles 3 and the rods 4 are interconnected by welds 5, which ensures their mutual anchoring in the zone of action of the vertical support reactions of the overlap

Such a constructive solution makes it possible to place the main tension reinforcement (profiles 3 and rods 4) in the alignment of bearing columns compactly across the slab thickness, which ensures uniform compression of the concrete during its hardening.

In the spans of the slabs of the slab 2, additional reinforcing bars (or rigid profiles 6) can be used, as well as reinforcement mesh 7 in cases where the calculated prestressing value does not ensure that the tensile forces are perceived by the concrete in the lower zone of the slab.

Profiles 3 and rods 4 are located with respect to columns 1 with gaps 8 filled with self-hardening concrete, which eliminates the need for welding at the joints between the slab joints and the columns and simplifies installation work due to the presence of cutting forces in the contact zone of the slab with the column. with columns in the latter arrange keyways 9.

During the construction of the frame using the inventory formwork 10

The erection process is carried out as follows.

Establish columns 1, as a rule with a height of 3-4 floors, assemble formwork

10, on which the profiles 3 and the rods 4, which are connected with them by welding through the holes in the walls, are installed, as well as the rods b and the grids 7, if necessary, according to the calculation. Next, the concrete slab is not reinforced with expanding cement. In the process of concrete hardening, spontaneous prestressing of the structure occurs, as a result of which, in profile x 3, rods x 4 and 6, and

5 also reinforcing grids 7 tensile forces arise, and compressive forces in the slab concrete. After the concrete has gained design strength, the final structure is dismantled.

0 During the static operation of the building frame under the influence of external loads, the transfer of loads from the overlapping to the columns is carried out due to the frictional forces arising between the concrete, filling gaps 8, column 1 and profiles 3. The magnitude of these frictional forces is determined by the level of concrete self-tension on expanding cement. For the most used in the construction of frames with spans up to 9 m

0 safety margin, i.e. the ratio of the total value of the friction forces to the value of the support reaction is about 3-4 or more. The perception of horizontal loads (wind, seismic) can be realized 5 s either by the frame scheme due to the stiffness of the nodes connecting the floors to the columns, or by the bond (or frame-link) scheme by means of stiffening diaphragms or links. Due to the presence of rigid profiles 3 in the frame, the rigidity of the nodes of the connection of columns with overlaps 2 is significantly increased.

The slab within each cell between columns 1 has a closed

5 reinforcing its contour, including rigid profiles 3 and rods 4. During the hardening process, tensile stresses arise in the profiles of the x and the rods, and in concrete slabs, the corresponding compressive stresses, which together form the initial prestressing forces in the structure. When acting on such a pre-stressed overlap of forces due to its own weight and from the payload in concrete, flat

5 of the plate, a membrane field of internal forces is formed, balanced by stresses in the tension reinforcement. Thus, the slab statically works as a shell, and the stress reinforcement performs the role of spatial tightening of the receiver.

Claims (1)

expansion, This kind of stress state of the structure allows the most complete use of the strength properties of concrete in compression and steel to stretch, which determines the efficiency of the structure as a whole, v Formula of the invention Building frame, including columns, an integral slab connected to them, consisting of prestressed reinforcement for dividing the floor FIG 0 on the cells, and concrete, characterized in that, in order to increase the bearing capacity while reducing labor costs during installation, the reinforcement of one of the directions is made in the form of a rigid vertical wall profile installed with a gap relative to the columns, and the reinforcement of the other direction is passed through the holes, formed in the walls of the profiles parallel to the outer edges of the columns, and rigidly connected to the profiles at the places of admission, while the concrete is made self-supporting / Fi & W FIG. five