RU138856U1 - OVERLAP JOINT CONNECTION OF REINFORCED CONCRETE COLUMN COLUMNS - Google Patents

Abstract

A butt joint of precast reinforced concrete columns with an overlap, including end sections of the lower and upper columns installed on the same vertical axis of the reinforced concrete frame with a gap in height and an overlap placed between the ends of the columns, through which the outlets of the longitudinal reinforcement of the lower column are passed, while the floor slabs are laid on a thin layer fine-grained concrete, with reinforcing outlets from the lower column passed through its channels and injected with quick-hardening fine-grained concrete, when fixing the position of the floor slab at the installation using nuts screwed on the reinforcing outlets and pressing the ceiling to the lower column, characterized in that the precast concrete columns have steel centering gaskets at the ends and working longitudinal solid reinforcement of the screw profile, interconnected by screwed on ends ends connecting releases of working reinforcement in the niche of the upper column, followed by wrapping around the junction with transverse clamps and choking them with quick-hardening fine-grained concrete m.

Description

The utility model relates to the field of construction and can be used in precast-monolithic reinforced concrete bezelless frames of multi-storey residential, social and industrial buildings.

Known butt connection of prefabricated columns with an overlap, including the end sections installed on the same vertical axis of the reinforced concrete frame with a gap in height of the lower column and the upper column with transverse steel sheets at the end of the end sections and rigidly connected with them, the overlap placed between the ends of the columns and passed through the overlap releases of column reinforcement in the form of studs, fastened at the ends with nuts in niches made in concrete on the side faces of the upper and lower columns, to the transverse steel sheet at the upper and lower columns, quotation nuts placed above the top of the ceiling for direct support of the upper column, with gravy and caulking niches with quick-hardening fine-grained concrete (Patent RU No. 2244787, IPC E04B 1/21, E04B 1/38, publ. 20.01.2005).

The disadvantages of the butt joint are the lack of reliability and rigidity of the butt joint due to the presence of two bolted joints of each outlet of the reinforcement, spaced along the height of the overlap section, interruption of the working reinforcement in both the upper and lower columns, with the transfer of forces from it through the end transverse steel sheets on the studs. In addition, the butt joint has an increased metal consumption due to the presence of two transverse steel sheets of columns in one node at once, as well as increased labor intensity.

A butt joint of prefabricated reinforced concrete columns with a monolithic overlap is known, including end end sections of columns installed with a gap along the vertical axis, a monolithic reinforced concrete overlap placed between them, reinforcing connecting elements passed through the overlap, united by a closed reinforcing collar and monolithic concrete, characterized in that the end section of the upper column is equipped with a commensurate precast concrete reinforced insert of high-strength concrete of class B40-B60, monolithic paired with a column. In this case, the reinforcing connecting elements of the upper column are passed through the through vertical holes of the liner and placed within the recess of the liner, and the reinforcing connecting elements of the lower column are passed through the overlap and placed in the recesses of the liner with overlapping reinforcing connecting elements of the upper column and monolithic with high-strength concrete of class B40-B60 ( Patent RU No. 2380494, IPC E04B 1/38, publ. 01.27.2010).

The disadvantage of a butt joint is insufficient reliability when bending moments are applied to the joint due to the short overlap length of the working reinforcement in the columns, while if the overlap length is increased by analogy with this solution, the overlap of the reinforcement will lead to a sharp increase in the steel consumption in the joint. Another disadvantage of the solution is the use of small amounts of high-strength concrete at the junction for recessing niches, which cannot be delivered to the construction site in such a volume or produced at the site. This butt joint has a constructive solution that does not allow the overlap of prefabricated.

Known butt joint coaxially installed with a gap in height of reinforced concrete columns, in which special U-shaped and G-shaped reinforcing loop outlets of the lower and upper columns are monolithic (RF Patent No. 2303678, IPC E04B 1/38, published on July 27, 2007).

The disadvantage of this butt joint is a constructive solution that does not allow overlapping by prefabricated and loop outlets overlapping with each other lead to an increase in steel consumption in the joint. Reinforcing outlets need to be welded together, while their additional bending is required in place to bring in the design position. This leads to a complication of the construction of a reinforced concrete frame.

It is known to connect reinforced concrete columns and a floor slab of a bezelless capless frame of a building, comprising a prefabricated floor slab with a rectangular hole in which a steel shell is rigidly mounted, made in the form of two truncated pyramids, paired with each other with its small bases, and a column passed through the shell with an exposed the zone of the shell by power reinforcement connected to welding with the shell by means of steel trapezoidal connecting elements (RF Patent No. 2203369, IPC E04B 1/38, publ. 04/27/2003 )

The disadvantage of this connection is the increased consumption of steel associated with the use of a steel shell in the ceiling. Also its disadvantages include the difficulty of mounting on the construction site due to the use of welding in the connection of elements.

Known butt connection of prefabricated columns with an overlap, including the connection of the end sections of the lower and upper prefabricated columns, the overlap placed between their ends and the longitudinal reinforcement outlets passed through the overlap with the screw thread of the lower column, fixed at the ends with nuts to the transverse steel sheet rigidly connected to the end of the upper columns, in niches made in the upper column, followed by caulking them with quick-hardening fine-grained concrete. At the junction there are quotation nuts and pressing metal supporting washers made in the form of truncated cones, as well as a central channel for injection (Patent RU No. 2333323, IPC E04B 1/38, E04B 1/20, publ. 10.09.2008). This butt joint is the closest analogue of the claimed invention.

The disadvantages of this butt joint are the lack of reliability and rigidity of the butt joint due to interruption of the working reinforcement in the upper column, with the transfer of forces from it through the end transverse steel sheet to the outlets of the lower column reinforcement. In addition, the butt joint has an increased metal consumption due to the presence of a transverse steel sheet of the upper column and a large number of assembly metal parts, as well as increased labor intensity associated with a large number of mounted parts at the joint and the need to perform threads.

The objective of the utility model is to increase the reliability, accuracy of installation while accelerating the installation process, as well as reducing metal consumption.

This is achieved by the fact that the butt joint of precast reinforced concrete columns with an overlap includes end sections of the lower and upper columns mounted on the same vertical axis of the reinforced concrete carcass with a height gap and an overlap placed between the ends of the columns, through which the longitudinal reinforcement of the lower column is passed, while prefabricated reinforced concrete columns have steel centering gaskets at the ends and working longitudinal solid reinforcement of the screw profile, interconnected by screwing onto clutches joining the outlets of the working reinforcement in the niche of the upper column, followed by grasping the junction with transverse clamps and choking them with quick-hardening fine-grained concrete. Floor slabs have at least four channels, while laying on a thin layer of fine-grained concrete, reinforced outlets from the lower column passed through the channels and injected with quick-hardening fine-grained concrete, while fixing the position of the floor slab at the installation using nuts screwing onto the reinforcing outlets and pressing the overlap to the bottom column.

Distinctive features of the butt joint of precast reinforced concrete columns with overlapping are the presence of steel centering spacers at the ends of the precast concrete columns and the working longitudinal continuous reinforcement of the screw profile, interconnected by screwed-on couplings at the ends.

Due to the presence of these signs, conditions are created to accelerate and simplify installation, as immediately after installation on the lower column of the overlap and pouring of the channels of the overlap with the longitudinal reinforcement of the lower column passing through them, quick-hardening fine-grained concrete, the overlap is pressed to the lower column with nuts and couplers pressed to them, which rigidly fix the joint of the overlap with the column and absorb all installation efforts at the junction, which makes it possible immediately, without waiting for the strength to be obtained with fine-grained concrete in the floor channels, to continue the installation of floors adjacent to the floor and columns with edachey installation effort from them to the previously mounted column with an overlap. In addition, the longitudinal reinforcement of the upper and lower columns are not interrupted.

The proposed connection is illustrated by drawings, which depict:

in FIG. 1 - butt connection of prefabricated columns with overlap;

in FIG. 2 is a section A-A of FIG. one;

in FIG. 3 is a section B-B of FIG. one;

in FIG. 4 - element-wise installation of columns and ceilings.

The butt joint of prefabricated columns with overlapping (Fig. 1-3) includes an end section (1) of the lower and end section (2) of the upper abutting columns on the flat ends of which there are centering steel gaskets (3). At the end of the end section (2) of the upper column there is a narrowing of the concrete part, forming a niche (4) with releases of the working reinforcement (5) of the screw profile. From the end of the end section (1) of the lower column, there are outlets of the longitudinal reinforcement (6) of the screw profile directed upwards. Between the ends of the columns placed overlap (7) on a thin layer of fine-grained concrete (8).

The overlap (7) has channels (9) injected with quick-hardening fine-grained concrete (8), through which the outlets of the longitudinal reinforcement (6) of the lower column are passed. Nuts (10) are screwed onto the outlets (6) of the lower column, fixing the position of the floor slab (7) and pressing it to the end of the end section (1) of the lower column. Outlets (5) and (6) are joined in the niche level (4) of the upper column through steel screw couplings (11), which press on the screwed nuts (10). The outlets of the columns (5), (6) and the coupling (11) within the niche (4) are covered with clamps (12) and the entire joint is minted with quick-hardening fine-grained concrete (8).

A method of performing the butt connection of prefabricated columns with overlapping is as follows. After the lower column is installed, a thin layer of quick-hardening fine-grained concrete (8) is laid on the end of its end section (1) with the releases of the longitudinal reinforcement (6) of the screw profile directed upward and with a centering steel gasket (3).

Then, the ceiling (7) is installed on the end of the end section (1) of the lower column and on the mounting posts (not shown), passing the valve outlets (6) through the channels in the ceiling (9), level its horizontal position, and then fill the channels (9 ) quick-hardening fine-grained concrete (8). Then, on the outlets (6), clamping nuts (10) are placed, which are tightened by the amount of mounting loads, and which fix the position of the overlap (7) until the joint with the upper column is completed. After this, the bottom column-floor assembly is immediately capable of absorbing loads from adjacent floor slabs.

Then lower the upper column, with pre-baited couplings (11) on the outlets of the working armature (5) of the end section (2). Clutches (11) are put on the ends of the reinforcing outlets (6) of the lower column and are screwed into the clamping nuts (10) until they stop. At the same time, outlets (5) and (6) form an equal strength connection of the working reinforcement of the column. After fixing the upper column, the working reinforcement (5) and (6) together with the couplings (11) are wrapped around with transverse clamps (12) and the niche (4) is minted with quick-hardening fine-grained concrete.

In the proposed design of the butt joint without the use of welding, conditions are created to accelerate installation and increase the reliability and rigidity of the joint. Acceleration of installation speed is achieved by reducing the number of assembly positions in the node, and the reliability and rigidity of the joint is increased by creating continuity of the working fittings in the joined columns. Due to the use of longitudinal reinforcement of the screw profile, there is no need for preliminary threading on the reinforcement, as well as reduced metal consumption for the joint, due to a decrease in the number of assembly parts.

Claims (1)

A butt joint of precast reinforced concrete columns with an overlap, including end sections of the lower and upper columns installed on the same vertical axis of the reinforced concrete frame with a gap in height and an overlap placed between the ends of the columns, through which the outlets of the longitudinal reinforcement of the lower column are passed, while the floor slabs are laid on a thin layer fine-grained concrete, with reinforcing outlets from the lower column passed through its channels and injected with quick-hardening fine-grained concrete, when fixing the position of the floor slab at the installation using nuts screwed on the reinforcing outlets and pressing the ceiling to the lower column, characterized in that the precast concrete columns have steel centering gaskets at the ends and working longitudinal solid reinforcement of the screw profile, interconnected by screwed on ends ends connecting releases of working reinforcement in the niche of the upper column, followed by wrapping around the junction with transverse clamps and choking them with quick-hardening fine-grained concrete m.

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