RU2498035C1 - Spacer for building column reinforcement - Google Patents

Spacer for building column reinforcement Download PDF

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Publication number
RU2498035C1
RU2498035C1 RU2012119370/03A RU2012119370A RU2498035C1 RU 2498035 C1 RU2498035 C1 RU 2498035C1 RU 2012119370/03 A RU2012119370/03 A RU 2012119370/03A RU 2012119370 A RU2012119370 A RU 2012119370A RU 2498035 C1 RU2498035 C1 RU 2498035C1
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RU
Russia
Prior art keywords
strip
strut
spacer
angular
corner
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RU2012119370/03A
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Russian (ru)
Inventor
Николай Алексеевич Ильин
Рустам Рафаилович Ибатуллин
Александр Петрович Шепелев
Павел Николаевич Славкин
Original Assignee
Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Самарский государственный архитектурно-строительный университет" (СГАСУ)
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Priority to RU2012119370/03A priority Critical patent/RU2498035C1/en
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Abstract

FIELD: construction.
SUBSTANCE: spacer of a steel shell includes a pair of angular stands and connecting planks, which are fixed to each other by a welded joint in the form of a complex seam, at the same time the connecting plank is made in the form of a steel plate, dimensions and shape of the end and middle section of which are taken on the basis of conditions of the bearing capacity of the plank and the welded joint.
EFFECT: increased reliability of operation of welded butt and lapped joints.
15 cl, 11 dwg

Description

The invention relates to the construction and can be used in the strengthening (repair, restoration and reconstruction) of supporting structures, more specifically in the reinforcement of concrete, reinforced concrete and stone columns of buildings.

It is known a spacer device for reinforcing a column, which contains a pair of non-tensioned spacers of a metal cage, each spacer of which is made of two corners installed along the faces of the column, and connecting strips between them. The step of the strips is taken equal to the minimum size of the column section. The metal clip is made as an independent system according to the design standards of steel structures. / Reconstruction of buildings and structures; under the editorship of A.L. Shagina; tutorial. - M .: Higher school, 1991, - 352 p .; (see p. 10.5 Strengthening columns; Fig. 10.40, p. 182-183) / [1].

For reasons that impede the achievement of the technical result indicated below when using the known device of the spacer steel cage for reinforcing the column, the known device is very bulky and metal-intensive, since the steel cage has large dimensions in plan due to the protrusion of the connecting strips, beyond the outer edges of the corner posts struts; while the dimensions of the cross section of the connecting strips are taken constructively, with a large safety factor for bearing capacity (k 3 ≥3); the actual fire resistance of the column reinforced with a steel cage is not high due to the lack of structural fire protection of its metal elements.

A spacer device is known for reinforcing columns with prestressed metal profile elements (spacers). / A.c. SU 100439, CL E04G 23/02. The way to strengthen the column. / N.M. Onufriev (class 37b, 3-03); application No. 9351/449 710 from 09/28/1953 / [2].

For reasons that impede the achievement of the technical result indicated below when using the known device of the spacer steel cage, the fact that the cross-section of the connecting strips is made structurally, as a result of this, the steel costs for their manufacture are high.

A spacer device is known for reinforcing a multi-story column, which contains two double-sided prestressed spacers consisting of two corners L 75 × 50 × 5 mm and connecting strips (step S = 55 cm) with a cross section of 100 × 6 mm (accepted for structural reasons); it also shows the sequence of strength analysis and selection of the profile of corner posts, section of the strips, as well as the procedure for checking welds; / Recommendations on strengthening monolithic reinforced concrete structures of buildings and structures of mining enterprises. - M.: Stroizdat, 1974. - 96 s (see Strengthening the column with prestressed struts, p.6.9 p. 60-61; Appendix 1, calculation example, p.79-81) / [3].

The reasons that impede the achievement of the technical result indicated below when using the known device include the fact that the known reinforcement strut device is very bulky and metal-intensive, since the steel clip has large dimensions in plan due to the protrusion of the connecting strips beyond the outer edges of the corner struts of the strut; the cross-sectional dimensions of the connecting strips are taken constructively, with a large overspending of construction steel.

The closest technical solution to the invention in terms of features is a device containing steel prestressed struts (two pairs), connecting strips, thrust angles, straps - stops, mounting mounting bolts; in this case, the connecting strips are made from structural considerations (from plate steel with a thickness of δ≥6 mm; a width of b = 80 mm), tension bolts ⌀20 mm; the design of the constricted compressed elements of their corners is performed as solid-wall, provided that the greatest distance in the sections between the welded strips (in the light) does not exceed S u ≤40 · τ x (where τ x is the inertia radius of the equal-shelf corner of the corner post); the design of the connecting strips are made for shear and bending. / Onufriev N.M. Reinforcement of reinforced concrete structures of industrial buildings and structures. - L., M: Stroyizdat, 1965 .-- 342 p. (see. 22 Column reinforcement by means of prestressed reinforcement struts; Fig. 83, p. 241-247; example 20, Fig. 86, p. 252-256) / [4], taken as a prototype.

The reasons that impede the achievement of the technical result indicated below when using the known spacer device for reinforcing the column adopted as a prototype include the fact that the known device is metal-consuming and bulky due to an increase in the dimensions of the cage in terms of the protrusion beyond the outer edges of the corner posts of the struts of the connecting strips, the geometric dimensions of which are taken for structural reasons with a safety factor of k 3 ≥3 (cost overrun of rolled steel by weight 3.5–4 times); the elements of the steel cage are designed and manufactured without taking into account the joint work with the reinforced column, therefore, the accepted ultimate flexibility of the corner struts of the spacers that determine the step of the connecting strips for compressed (stretched) elements are taken unreasonably small: S min = 40 · τ x (here S min is the minimum step planks, cm; τ x is the radius of inertia of an equal-shelf angle, cm); when designing welded joints, modern types of welds are not taken into account; the actual fire resistance of the column, reinforced with struts of the steel cage, is not high due to the lack of structural fire protection of its metal elements.

The invention consists in the following. The task to which the invention is directed is to simplify the design of the spacers of the steel cage to strengthen the column of the building, reduce the dimensions of the steel cage in plan, reduce the error in assigning the geometric dimensions of the connecting strips for bending, increase the accuracy of determining the size and actual bearing capacity of welds, connecting the corner struts of the spacer and connecting strips, calculated for shear and bending, reducing the consumption of structural steel for the manufacture of struts for reinforced I'm building the tower.

The technical result of the invention is to simplify the design of the spacer steel cage, reducing its dimensions in plan, designing the geometric dimensions of the connecting strips for bending, increasing the actual bearing capacity of the welds for the connecting strips based on the seams for shear and bending, the rational use of various types of welds for the connecting elements of the spacer butt and lap; improving the quality and reliability of welded joints; reduction in metal consumption and the complexity of manufacturing struts steel clips; increasing the degree of fire protection of the metal elements of the steel cage.

The specified technical result in the implementation of the invention is achieved by the fact that in the known strut reinforcement columns of the building, including a pair of corner struts struts and connecting strips, which are fastened together by a welded lap joint in the form of an angular seam at the ends of the strip, the feature is that each connecting strip struts made in the form of a steel plate, the dimensions and shape of the end section of which are taken from the condition of the bearing capacity of the welded joint with an angular strut struts and the size conditions eniya weld butt or overlapped calculated shear and bending; the dimensions of the cross section of the middle section of the spacer connecting strip are taken from the condition of the flexural strength of the strip.

The end section of the connecting strap is made in the form of a brand. The end portion of the connecting strap is made with a notch in the form of a rectangle, triangle, semicircle.

The end portion of the connecting strip is made with countersink holes for spot welding with an angular strut strut. The connecting strip is made shortened in the form of a plate installed between the ends of the feathers of the corner of the corner struts of the strut and fastened with butt welds.

The connecting strip is made of a piece of expanded metal sheet.

The welded joint of the angular strut struts with the connecting strip is overlapped in the form of angular frontal and flank seams.

The welded joint of the angular strut strut with the connecting strip is overlapped in the form of angular one-sided frontal seams at the end of the connecting bar and at the end of the feather strut struts.

The welded joint of the angular strut struts with the connecting strip is overlapped in the form of an angular frontal seam at the end of the connecting strip together with a welded point connection at the end portion of the connecting strip.

The welded joint of the corner strut strut with the connecting strip is overlapped in the form of fillet welds at the end of the connecting strip and at the end of the feather of the corner strut strut complete with a welded point connection at the end portion of the connecting strip.

The welded joint of the corner strut struts with the connecting strip is made in the form of angular horizontal and inclined welds at an angle of 60 ° at the end section of the connecting strip.

The welded joint of the corner strut struts with the connecting strip is made in the form of one-sided angular flank horizontal and circular welds at the end portion of the connecting strip.

The welded joint of the corner strut strut with the connecting strip is made in the form of a welded butt seam between the feather of the corner strut strut and the end of the connecting strip.

The welded joint of the corner strut struts with a connecting strip, adopted in the form of a piece of expanded metal sheet, is made in the form of a key weld with a length of 1≥50 mm.

The connecting strip, when using a welded butt joint, is made with a high height with holes for passing concrete or mortar reinforcing columns.

The drawings show:

Figure 1 shows the design of the spacers to strengthen the columns of the building: 1 - reinforced column; 2 - corner rack; 3 - a connecting level; 4 - fillet weld; 5 - flank weld; 10 - end section of the connecting strip; 11 - the middle section of the connecting strip; 13 - a fixing level; 14 - fillet weld (from the back); 15 - a persistent corner; 16 - level - emphasis; 17 - a fixing bolt (plate); (S n is the step of the connecting strips; Z o is the distance from the center of gravity (center of gravity) of the corner post to the outer edge of the shelf; C is the distance between the center of gravity of the corner struts of the spacer).

Figure 2 shows a section aa struts for reinforcing columns:

2 - corner rack; 3 - a connecting level; 4 - fillet weld; 14 - fillet weld (from the back); (the designations Z o , C, and c.t. are shown in the caption to figure 1).

Figures 3 and 4 show the connection of the branches of the corner strut struts with a connecting strip in the form of a welded butt seam between the feathers of the corner struts of the strut and the ends of the connecting strip (cross-section of the connection - section BB): 2 - corner strut; 3 - a connecting level; 6 - butt weld; (l o is the shortened length of the connecting strip, δ is the thickness of the strip; l w is the length of the butt weld).

Figures 5 and 6 respectively show a shortened connecting strip in the form of an I-beam and a plate with holes: 3 - a connecting strip; 6 - butt weld; (l o is the shortened length of the strip, δ is the thickness of the strip; l w is the length of the weld).

Figures 7 and 8 show a lap joint of a corner post and a connecting bar in the form of a complex weld, including an angular frontal, keyway and a spot weld:

2 - corner rack; 3 - a connecting level; 4 - fillet weld;

5 - flank weld; 7 - welded point connection;

9 - keyway seam; 10 - end section of the connecting strip;

11 - the middle section of the connecting strip.

Figure 9 shows the lap joint of the corner post and the connecting strip by applying fillet welds from the front and back: 2 - corner post; 3 - a connecting level; 4 - fillet weld; 10 - end section of the connecting strip; 11 - the middle section of the connecting strip; 14 - fillet weld (from the back).

Figure 10 and 11 shows the lap joint of the corner post and the connecting strip, made with a cutout on the end sections of the plate in the form of a triangle (figure 10) and a rectangle (figure 11) by applying a complex weld: 2 - corner post;

3 - a connecting level; 4 - fillet weld; 5 - flank weld; 9 - keyway seam; 10 - end section of the connecting strip;

11 - the middle section of the connecting strip; 14-corner weld (from the back).

Information confirming the possibility of carrying out the invention with obtaining the above technical result

An example of a specific implementation. A steel clip for reinforcing a reinforced concrete column with a cross section of 400 × 500 mm contains tension struts made up of two pairs of corner posts and connecting strips 3. The corner posts 2 are made of steel (C 245 steel) rolling profile - equal-angle corners 2L 125 × 125 × 10 mm: shelf width b = 125 mm; shelf thickness S = 10 mm; moment of inertia J x, y = 360 cm 4 ; radius of inertia τ x = 3.85 cm; sectional area A = 24.3 cm 2 ; the distance from the center of gravity to the outer edge of the shelf Z o = 3.45 cm; density of rolled products ρ = 7850 kg / m 3 ; elastic modulus E = 2.1 · 10 6 kgf / cm 2 . The connecting strips 3 are made of plate steel C 235 (grade BCt3kp2); strip thickness δ = 8 mm; lath height b = 80 mm; the weld joint of the struts 2 struts and the connecting strip 3 is performed by a complex weld, including two fillet welds 4 and 14 (from the front and back of the strip) of length l ug = 8 cm each, plus one corner flank weld 5 of length l fl = 6 cm; total at each end section of the connecting strip, the length of the complex seam is:

l W = 2 · l yr + l fl = 2 · 8 + 6-22 cm;

the leg of the weld k W = 6 mm; welding is carried out with coated electrodes of type E-42A (GOST 9467-75 *); design resistance of welded joints with fillet welds R ωf = 180 MPa (1850 kgf / cm 2 ).

The introduction of the connecting strips in the work of the corner struts struts made as follows.

First, corner posts 2, connecting strips 3 and fastening strips are made in workshops 13. For a tight fit of the corner posts 2, the concrete surface is carefully leveled along the edges of the reinforced column 1 by shearing the damaged concrete and caulking with cement mortar. The prestressing of the connecting and fixing strips is carried out thermally. For this, the connecting strip 3 or the fixing strip 13 is welded on one side to the corner posts 2 of the spacer, then the middle portion of the connecting strip 11 is heated with a gas torch to (120 ± 20) ° C and the second end of the strip is welded in a heated state.

The closure of the straps is carried out symmetrically from the average height of the column of the belt. When the strips cool down, the cross sections of the reinforced column are compressed, which significantly increases its bearing capacity. An effective means of strengthening the loaded columns of the building is the device of prestressed steel struts: prestress (60 ± 20) MPa or (600 ± 200) kgf / cm 2 . The step of the connecting fastening strips (bolts) in the light is taken equal to the width of the column section facet (S 1 = 40 cm; S 2 = 50 cm).

The use of the proposed struts to strengthen the columns of the building allows you to restore operational properties (bearing capacity, fire resistance) and improve quality indicators: the device is easy to use and install due to the rational use of rolled metal; spacer design reduces metal costs for the manufacture of connecting and mounting strips by 3.5-4 times; the geometric dimensions of the cross section of the connecting and fixing strips are taken directly from the results of calculating them for shear force and bending (k s = 1.05-1.1); reduction of the cross-sectional dimensions of the column of the reinforcement cage due to the absence of protrusions beyond the outer edges of the corner posts of the connecting and fixing brackets of the spacers (provided they are butt welded) in the design of overlap and butt welds, complex types of welds (frontal, flank, keyway, butt, butt weld in the countersink holes of connecting and fixing strips) are adopted. The high fire resistance of the column, reinforced by a steel cage, is achieved by the use of constructive fire protection of its steel elements.

The proposed device is used in the construction industry when reinforcing columns of a residential building (with a built-in trading floor on the ground floor), damaged by a continuous fire. The survey of severely damaged first-floor columns with a height of H = 3.8 m and the issuance of recommendations for the restoration of columns were carried out as soon as possible (Samara, 2011).

Information sources

1. Reconstruction of buildings and structures; under the editorship of A.L. Shagina; tutorial. - M .: Higher. school, 1991, - 352 s. (see p. 10.5 Strengthening columns; Fig. 10.40, p. 182-183).

2. A.c. SU No. 100439, cl E04G 23/02. The method of amplification of the column. / N.M. Onufriev (class 37b, 3-03); application No. 9351/449 710 from 09/28/1953.

3. Recommendations for strengthening monolithic reinforced concrete structures of buildings and structures of mining enterprises. - M.: Stroizdat, 1974. - 96 p. (see Strengthening the column with prestressed struts, p. 6.9 p. 60-61; Appendix 1, calculation example, p. 79-81).

4. Onufriev N.M. Reinforcement of reinforced concrete structures of industrial buildings and structures. - L., M: Stroyizdat, 1965 .-- 342 p. (see 22 Column reinforcement by means of prestressed spacers; fig. 83, p. 241-247; example 20, fig. 86, p. 252-256).

Claims (15)

1. A spacer for reinforcing the column of the building, including a pair of corner struts of the strut and connecting strips, which are fastened together by a lap weld in the form of an angular seam at the ends of the strip, characterized in that each connecting strip of the strut is made in the form of a steel plate, the size and shape of the end a portion of which is taken from the condition of the bearing capacity of a welded joint with an angular strut strut and the conditions for placing a welded joint butt or lap, designed for shear and bending; the dimensions of the cross section of the middle section of the spacer connecting strip are taken from the condition of the flexural strength of the strip.
2. The spacer according to claim 1, characterized in that the end portion of the connecting strip is made in the form of a brand.
3. The spacer according to claim 1, characterized in that the end portion of the connecting strip is made with a notch in the form of a rectangle, triangle, semicircle.
4. The spacer according to claim 1, characterized in that the end portion of the connecting strip is made with countersink holes for spot welding with an angular strut strut.
5. The spacer according to claim 1, characterized in that the connecting strip is made shortened in the form of a plate installed between the ends of the feathers of the corner of the corner struts of the strut and fastened with butt welds.
6. The spacer according to claim 1, characterized in that the connecting strip is made of a piece of expanded metal sheet.
7. The spacer according to claim 1, characterized in that the welded joint of the angular strut struts with the connecting strip is made overlap in the form of angular frontal and flank seams.
8. The spacer according to claim 1, characterized in that the welded joint of the angular strut strut with the connecting strip is overlapped in the form of angular one-sided frontal seams at the end of the connecting strip and at the end of the feather strut struts.
9. A spacer according to claims 1, 4 and 7, characterized in that the welded joint of the corner strut of the spacer with the connecting strip is overlapped in the form of an angular frontal seam at the end of the connecting strip together with a welded point connection at the end portion of the connecting strip.
10. The strut according to claim 1, characterized in that the welded joint of the corner strut of the spacer with the connecting strip is overlapped in the form of fillet welds at the end of the connecting strip and at the end of the feather of the angular strut of the strut complete with a welded point connection at the end portion of the connecting strip.
11. The spacer according to claim 1, characterized in that the welded joint of the corner strut struts with the connecting strip is made in the form of angular horizontal and inclined at an angle of 60 ° welds at the end portion of the connecting strip.
12. The spacer according to claim 1, characterized in that the welded joint of the corner strut struts with the connecting strip is made in the form of one-sided angular flank horizontal and circular welds at the end portion of the connecting strip.
13. The spacer according to claim 1, characterized in that the welded joint of the corner strut of the spacer with the connecting strip is made in the form of a welded butt joint between the feather of the angular strut of the strut and the end of the connecting strip.
14. The spacer according to claims 1 and 6, characterized in that the welded joint of the corner strut struts with a connecting strip, adopted in the form of a piece of expanded metal sheet, is made in the form of a key seam 1≥50 mm long.
15. The spacer according to claim 1, characterized in that the connecting strip, when using a welded butt joint, is made with high height with holes for passing concrete or mortar reinforcing columns.
RU2012119370/03A 2012-05-11 2012-05-11 Spacer for building column reinforcement RU2498035C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6718723B1 (en) * 1999-01-09 2004-04-13 Al-Tuhami AbuZeid Al-Tuhami Method and apparatus for strengthening the concrete elements using prestressing confinement
RU2277620C1 (en) * 2004-10-18 2006-06-10 Александр Петрович Мишин Building structure reinforcement method
RU2308581C2 (en) * 2005-10-03 2007-10-20 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный архитектурно-строительный университет" (СГАСУ) Column and column head reinforcing device
JP2009138478A (en) * 2007-12-10 2009-06-25 Daichi Koei Kk Rc column reinforcing method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6718723B1 (en) * 1999-01-09 2004-04-13 Al-Tuhami AbuZeid Al-Tuhami Method and apparatus for strengthening the concrete elements using prestressing confinement
RU2277620C1 (en) * 2004-10-18 2006-06-10 Александр Петрович Мишин Building structure reinforcement method
RU2308581C2 (en) * 2005-10-03 2007-10-20 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный архитектурно-строительный университет" (СГАСУ) Column and column head reinforcing device
JP2009138478A (en) * 2007-12-10 2009-06-25 Daichi Koei Kk Rc column reinforcing method

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Effective date: 20140512