RU2581063C2 - Method for rigid connection of self-stressed composite column, having no base, with reinforced concrete foundation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to a method of connecting composite column to foundation. Method of rigid connection self-stressed composite column, having no base, with reinforced concrete foundation is started with installation of steel column on the foundation, in which there are anchor rods. In the body of string pierced holes according to location of anchor rods. Column is equipped with longitudinal split couplings. Column is installed on foundation in design position by means of retainer teeth. After installation of string in design position are longitudinally split coupling, the body of the column is filled with self-stressed concrete. For connection of the column with foundation longitudinally split couplings made with due allowance for configuration of anchor rods are used.

EFFECT: technical result consists in reduction of labour hours during assembly.

1 cl, 3 dwg

Description

The present invention relates to the construction of building (steel-concrete) structures, as well as the formation of their nodal joints.

Currently, the connection of steel columns with a reinforced concrete foundation is carried out using anchor plates and anchor bolts with washers [1, p. 199, fig. 8.18]. Anchor plates are welded to the column base structure manually using electric arc welding. When welding in winter and in bad weather conditions, the quality of the joints decreases sharply, and labor productivity drops. The connection is not technological, the base design is bulky and material-intensive due to the presence of traverses and supporting ribs. It also excludes the possibility of straightening the column in height during adverse precipitation of the foundation.

Connections of reinforced concrete columns with foundations both centrally and eccentrically loaded are performed by the so-called “glass type” [2, p. 445, fig. 163]. Straightening the design position of such nodes is complicated and is not performed. In winter, when filling the "glass" with water, the concrete foundation breaks.

The well-known "Method of rental" [5] hot-rolled reinforcement of a periodic profile. Hire is performed on a rolling mill in a hot state by oblique transverse knurling of the reinforcement rifts along a helical spiral on the outer surface of a single-start or multi-start. The reef profile is rolled smoothly along a sinusoid.

The advantages of such fittings are undeniable, as it is easily connected in the longitudinal direction by screw couplings similar to water couplings, however, the rental of such fittings has not yet been established by the rolling shops of the iron and steel industry. Quick disconnect connections of columns with anchor rods, the reefs of crests and troughs of which have a chaotic relief, were not found.

Known "Anchor device" [4] proposed by Nezhdanov K.K. and designed with graduate students. Anchor device provides reliable equal strength connection of reinforcing bars of a periodic profile. We will accept the patent of Russia [4] for the prototype. Anchor device can be improved.

The technical task of the invention is the development of a technological method for rigidly connecting a self-tensioning steel-concrete pipe column without a base to a reinforced concrete foundation by attaching anchor rods to the column with quick-disconnect couplings with a longitudinal joint, making it possible to straighten the column in height and reducing the complexity of installation and material consumption of structures.

The technical problem of a method for rigidly connecting a self-tensioning steel-concrete pipe column without a base to a reinforced concrete foundation by attaching anchor rods to the column with quick-disconnect couplings with a longitudinal joint is solved in the following technological sequence.

Each billet for the coupling is cast by continuous casting from the alloy steel alloy quick disconnect relative to the longitudinal plane of symmetry, of the same strength as anchor rods with a cross-sectional area of two billets 8 ... 10% larger than the cross-sectional area of the anchor rod.

One of the halves of the continuously cast billet is provided with a longitudinal cylindrical groove along the longitudinal axis with a diameter corresponding to the minimum diameter of the anchor rods. Casting is performed from alloy steel of the same strength as anchor rods.

Continuously cast billets are cooled to the temperature of the plastic state of 950 ... 1050 ° C of hot rolled products and are fed into the rolling mill stand to the rolling mill stand.

In the mill stand, a longitudinal cylindrical trough is longitudinally run around with several rolls in a plastic state on one half of the workpiece and squeeze reefs of crests and depressions in it, copying the corresponding reefs of crests and hollows of the tube sinusoidal profile along the right or left helical spiral, one-way or multi-way, with smooth, rounded on a sinusoid hollows and ledges.

Moreover, the height of the reefs is equal to half the pitch of the helical spiral of the anchor rods. At the same time, the holes in the lateral elements of each half of the coupling are stitched for rental for longitudinally detachable connection.

Mechanically cut the finished long half into elements of standard length, mechanically remove the burrs, complete the halves of the couples in pairs and get ready-made quick-release couplings.

In the assembly, coaxial holes are mechanically deployed in each pair of coupling halves, the coupling halves are connected with tie rods (steel grade “40X Select”) and form a prefabricated longitudinally split coupling.

Reefs of ridges and depressions on the surface of the trough are rolled with any relief, for example, a relief corresponding to the currently rolled reinforcement of a periodic profile that does not have a helical spiral, right or left.

It is obvious that the reinforcement with reefs of ridges and depressions along a helical spiral will eventually displace the reinforcement of a periodic profile that does not have a helical spiral.

Holes are also stitched in the body of the column for connection with longitudinally split couplings according to the location of the anchor rods in the foundation. Before installation, the column is equipped with longitudinally split couplings and the ends of the column are milled.

The installation process begins with the installation of the steel column at the design mark on the foundation, in which the anchor rods are located, using locking teeth. After installing the column in the design position, the longitudinally split couplings are tightened with studs. The column body is filled with self-tensioning concrete [7, p. 1055]. Concrete in the body of the steel column expands, and the steel cage prevents expansion, due to which a self-straining steel-concrete column is formed. The result is a rigid connection of a self-tensioning steel-concrete column without a base with a reinforced concrete foundation by attaching anchor rods to the column with quick-disconnect couplings with a longitudinal joint. Vertical support reactions from the columns are transmitted to the foundation through anchor rods attached to the self-tensioning steel-concrete column by quick-disconnect couplings with a longitudinal joint.

In FIG. 1 shows a longitudinally coupled coupling in an assembly. In FIG. Figure 2 shows a rigid connection of a self-tensioning steel-concrete column without a base with a reinforced concrete foundation by attaching anchor rods to the column with quick-disconnect couplings with a longitudinal joint and a section 1-1. In FIG. 3 shows the node A.

One of the halves of the continuously cast billet 1 is equipped with a longitudinal cylindrical groove along the longitudinal axis with a diameter corresponding to the minimum diameter of the anchor rods 5. Continuous casting is performed from alloy steel of the same strength as the anchor rods 5.

The workpieces 1 and 2 are cooled to the temperature of the plastic state of 950 ... 1050 ° C of hot rolled products and are fed into the rolling mill stand (not shown) by rolling tables.

In the mill stand, several rolls longitudinally run a chute along the half of the continuously cast billet 1 and in the plastic state squeeze reefs of hollows and ridges in it.

The depressions and ridges copy the corresponding reefs of the ridges and depressions of the anchor rods 5 of the pipe sinusoidal profile along the right or left helical spiral, single or multiple, with smooth ridges and hollows rounded by a sinusoid.

Moreover, the depths of the reef basins is equal to half the pitch of the helical spiral of the anchor rods 5. At the same time, holes are flashed in the side elements of each half of the workpiece for longitudinally detachable connection during rolling.

Mechanically cut the finished long half of the workpiece into elements of a standard coupling length. Deburring is mechanized, the couplings of the couplings are completed in pairs and ready-made quick couplings are obtained.

In the assembly, coaxial holes are mechanically deployed in each pair of coupling halves 1 and 2. Connect the coupling halves with tie rods 3 with washers and nuts and form a collapsible longitudinally split coupling 4 for equal strength connection with anchor rods 5 having any periodic surface relief, for example, such what surface relief are the currently rolled reinforcing bars with a chaotic arrangement of reef crests and depressions.

In the body of the column 6, holes are also stitched for connection by longitudinally split couplings according to the location of the anchor rods 5 in the foundation. Before installation, the column 6 is equipped with longitudinally detachable couplings 4 and the ends of the column are milled.

The installation process begins with the installation of the steel column 6 at the design mark on the foundation 7, in which the anchor rods 5 are located, using locking teeth. After installing the column 6 in the design position, the longitudinally-detachable couplings are pulled 4. The body of the column 6 is filled with self-tensioning concrete 8. The concrete 8 in the body of the steel column 6 expands, and the steel cage prevents expansion, due to which a self-tensioning steel-concrete column is formed. The result is a rigid connection of a self-tensioning steel-concrete column without a base with a reinforced concrete foundation 8 by attaching anchor rods 5 to the column by quick-disconnect couplings with a longitudinal joint 4. Vertical support reactions from the columns are transmitted to the foundation 7 through anchor rods 5 connected to the self-tensioning steel-reinforced concrete quick couplings with longitudinal joint 4.

Comparison with the analogue shows the following technical differences:

1. There is the possibility of straightening the position of the column with uneven precipitation of the foundations;

2. Increases the manufacturability of the installation of nodes connecting the columns with the foundation;

3. The unit of connection of the steel-concrete column with the foundation with anchor rods is equally strong;

4. The vertical reaction and bending moment are transmitted to the foundation through anchor rods (similar to the roots of a tree), which allows for a significant reduction in material consumption.

The economic effect arises from the following:

1. Reduces the complexity of manufacturing as a result of automated manufacturing of longitudinally split couplings;

2. The connection of the steel-concrete column with the foundation with the help of longitudinally detachable couplings is technologically advanced in the manufacture and assembly.

3. The material consumption and the complexity of the structures is reduced due to the lack of a base.

Literature

1. Metal structures. General course: Textbook for high schools / E.I. Belenya, V.A. Baldin, G.S. Vedenikov et al .; Under the total. Ed. E.I. Bleached. - 6th ed., Revised. And add. - M .; Stroyizdat, - 1986 - 560 p., Ill.

2. Reinforced concrete and stone structures: Textbook for construction specialties of universities / V.M. Bondarenko, V.G. Nazarenko, V.I. Rimshin; edited by V.M. Bondarenko - M., Higher. school, 2007, 887 p .; silt

3. Reinforced concrete structures. General course / V.N. Baykov, E.E. Sigalov - Stroyizdat, M., 1991, 767 p.

4. Nezhdanov K.K., Tumanov V.A. Nezhdanov A.K. Anchor device. Patent RU No. 2228405 C2. E02D 27/50, E04B 1/38. Bull No. 13. Zareg. 05/10/2004. Prototype.

5. Patent RU 2467075 C2. Nezhdanov K.K., Nezhdanov A.K., Artyushin D.V. Method for rolling hot rolled reinforcement of a periodic profile. IPC C21D 8/08, B21H 1/18, E04C 5/03.

6. SNiP II-23-81 *. Steel structures / Gosstroy of the USSR. - M. TsITP Gosstroy USSR, 1990 - 96 p.

7. A large encyclopedic dictionary. (BES). Editor-in-chief A.M. Prokhorov. SCIENTIFIC PUBLISHING HOUSE “BIG RUSSIAN ENCYCLOPEDIA” M. 1998. S. 1456.

Item Numbers

1 - blank half of a longitudinally split coupling with a longitudinal groove

2 - preparation of a half of a longitudinally split coupling

3 - high-life coupling studs with washers and nuts

4 - longitudinally split clutch assembly

5 - anchor rod

6 - a column of steel pipe

7 - reinforced concrete foundation

8 - self-tensioning concrete.

Claims (1)

A method for rigidly connecting a self-tensioning steel-pipe concrete column without a base to a reinforced concrete foundation by attaching anchor rods to the column with quick-disconnect couplings with a longitudinal joint, namely, each billet for the coupling is cast continuously from molten alloy steel, longitudinally quick-disconnect relative to the plane of symmetry, such the same strength as anchor rods with a cross-sectional area of two workpieces 8 ... 10% more than the cross-sectional area of the joined rod, and one and halves of the workpiece are provided with a cylindrical groove with a diameter corresponding to the minimum diameter of the anchor rods, the workpieces are cooled to a temperature of plastic state of 950 ... 1050 ° C of hot rolled products and fed into the rolling mill stand for longitudinal rolling of the rolling mill, the flexible longitudinal groove of the workpiece is rolled longitudinally with several rolls in a plastic state, and extruded in it reefs of crests and troughs copying the corresponding reefs of crests and troughs of a tube sinusoidal profile along the right or left helical single-start or multi-start, with smooth hollows and protrusions rounded by a sinusoid, with reefs equal to half the pitch of the helical spiral of the anchor rods, at the same time, holes are flashed during the rolling of the side elements of each half of the coupling for longitudinally detachable joints, mechanically cutting the finished long half on elements of standard length, mechanically remove the burrs, complete the couplings of the couplings in pairs and get ready-made quick-disconnect couplings, mechanically deploy with axial holes in a pair of coupling halves, connect the coupling halves with tie rods and form a prefabricated longitudinally detachable coupling for equal strength connection with anchor rods, pierce holes in the body of the column according to the location of the anchor rods in the foundation, mill the ends of the column, provide the column with longitudinally split couplings, install steel column on the foundation, in which the anchor rods are located, getting into the design position with the help of locking teeth, after installing the column, they are pulled longitudinally nye clutch column body is filled with concrete to form samonapryagayuschimsya samonapryagayuschuyusya staletrubobetonnuyu column and all items manufactured automated compound without using inefficient manual welding.

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