Connection method for composite structures and units

FIELD: building, particularly connections specially adapted for particular building parts or for particular building structures and units.

SUBSTANCE: method involved using embedded members made as metal cylindrical cartridges arranged in concrete body of units to be connected in joint area thereof and metal connection member. Cylindrical cartridge interior is previously filled with adhesive composition. One end of connection member is placed in metal cartridge of the first unit to be joined, another end is inserted in that of the second one. Flange is welded to metal cartridge end. Flange is bored at 40° - 50° for the depth of 0.5 - 0.7 of flange thickness and conical flange bore passes into cylindrical one having dimension corresponding to metal connection diameter, which forms fixing clawing funnel. Ratio between inner cartridge diameter and connection member diameter is equal to dc,in/dcm = 1.5 - 2.0, where dc,in is inner cartridge diameter, dcm is metal connection diameter. Wherein resting outline is formed in area of metal cartridge abutment to flange. Resting outline has ledge of not less than 5 mm when connection member diameter is 10 - 30 mm, which prevents shear deformation development, increases squeezing degree and blocks metal connection. Cartridge has length Lc = (10-12)·dcm, which prevents slip of metal connection.

EFFECT: simplified assemblage technology.

2 dwg

 

The invention relates to the field of construction, and in particular to methods of connection of assorted designs and elements.

Known ways of connecting elements of buildings, in which the anchor of one of the connected element combine to overlap with the anchor of another connecting element [1,2].

The main disadvantages of the known methods is that to ensure the reliability of the connection length of the overlap shall be not less than 20-30 diameters of the anchor depending on the class steel anchor when placing these anchors in the compression area of the concrete, which is a limitation of the scope of the connection, and also leads to increased consumption of metal.

Known methods of connection of reinforced concrete structures by means of couplings or sleeves[3, 4, 5, 6, 7].

A disadvantage of known methods is the complexity of installation because of the diversity of technological operations and devices used for connecting rods butt.

Also known a method of connection of prefabricated elements of reinforced concrete structures, in which one of the joined elements has a valve release a smooth profile with a coupling on the end, which navertyvajut on the threaded release valve, extending from the recess anchor portion joined another [8].

The disadvantage of this method is the large number and complexity of those the ideological operations, consisting execution threads, screwing couplings special devices on the construction site.

The prototype of the proposed technical solution is the method of connection of precast concrete structures and elements, in which embedded parts, made in the form of metal plates and connected to the reinforced concrete structure or element by means of anchors, welded to each other directly or through a metal pad [9].

The disadvantage of the prototype is the complexity associated with the exact fixation of connected structures and elements, pre-treatment of welds (chamfer), the use of additional mounting devices, requires much time, energy. The use of welding contradicts the basic requirements of the development of precast construction, labour, mnogooperatsionny.

Object of the invention is the simplification of installation of precast concrete structures and elements by increasing productivity, eliminating energy-intensive welded joints with high strength connection.

The invention consists in that for the connection of precast concrete structures and elements use embedded parts, in the form of metal clips the cylinder is practical form, posted in concrete docked elements in the zone of the joint, the internal volume of which is pre-filled adhesive composition, and metallic bond, one end of which is slid into the metal ferrule of one of joined element and the other into the metal ferrule of the other abutting member, and the metal ferrule on the butt welded flange, the bore at an angle of 40-50° at a depth of 0.5-0.7 thickness of the flange with the transition to the cylindrical bore and the diameter of the metallic bond, which forms a funnel locking engagement, the ratio of the inner diameter of the shroud to the diameter of the connection is assumed to be

where dOC-inner diameter of the shroud;

dcthe diameter of the metallic bond,

this forms the contour emphasis in the area of the junction of the metal sleeve to the flange with the magnitude of the ledge not less than 5 mm in diameter connection 10-30 mm, which prevents the development of shear strain increases the compression and jams

metallic bond, and the length of the casing Labouthas been taken equal to: Labout=(10-12)dcprecluding slippage of the connection.

Thus, the connection of the abutting concrete structures not by welding but by forces of adhesion of the adhesive composition, the value of which is multiplied by shyness cross the deformation of the adhesive composition in a confined space.

Figure 1 shows the diagram of a method butt weld-free connection, where: a metal ferrule in the form of a cylinder of one of joined element 1, a metal ferrule in the form of a cylinder of the other abutting element 2, the flanges 3 and 4 cages 1 and 2 of joined elements, the locking funnel capture 5 and 6 metal clips 1 and 2, a metal link 7, the adhesive composition 8.

Figure 2 presents graphs of the carrying capacity of the junction N made the proposed method, the relative depth of seal L3pin connection.

The proposed method is as follows. In a metal ferrule cylindrical 1, placed in the concrete of one of joined element, the internal volume of which is pre-filled adhesive 8 having a metal link 7. This cone-shaped funnel capture 5 softserve nexus 7 in a metal holder 1. Then the second end of the link 7 is slid in the adjacent metal ferrule cylindrical shape 2, the internal volume of which is pre-filled adhesive composition 8. The cone-shaped funnel capture 6 softserve nexus 7 in a metal holder 2. Filling the internal space of the clamps 1 and 2, the adhesive composition 8 is determined by the displacement of excessive adhesive composition 8 in the space formed by the funnels 5 and 6. Stress, perceived connect the receiving lead to transverse deformation of the adhesive 8, placed in a closed cage 1 and volume 2. When this shear strain is converted into deformation and due to the effect of transverse expansion of the material, jam nexus 7 in metal cages 1 and 2.

As the adhesive composition, use mastics that have the property of expanding volume during hardening and the effect of increasing the ratio of internal strain with increasing stress (e.g., cement-sand mortar on expanding non-shrink cement, gypsum binder, and others).

As evidence that the work of the joint, figure 2 presents graphs of the carrying capacity of the junction N made the proposed method, the relative depth of seal L3. pin connection.

Curve 1 - pin connection made of deformed bars grade A-III;

Curve 2 - pin connection is made of smooth valve class A-I.

The tests showed that the bearing capacity of the pin connection depends on the depth of the sealing pin and grade of steel from which it is made. The greatest reliability have a connection in which the connection elements were made of deformed bars grade A-III and above without distinct sites fluidity.

Sources of information

1. Gelfand LI, Vasilije T.A. Horizontal the e joints earthquake-proof prefabricated buildings. Housing, M, 1986, No. 5, p.7.

2. Manual for design of concrete and reinforced concrete structures of heavy concrete (without voltage), M.: stroiizdat, 1978, s.

3. Pasternak P.L. and other Concrete structures, M: Gastrolyzer, 1961, p.86.

4. USSR author's certificate No. 838035, class E 04 1/58.

5. Japan's bid No. 57-3786 from 20.01.1977, class E 04 21/12.

6. The application of Germany No. 3008025 from 29.01.1980, class E 04 5/16.

7. Japan's bid No. 56-7016 from 30.07.1974, class E 04 5/18.

8. Japan's bid No. 55-40144 from 15.11.1976, class E 04 1/58 // E 04 5/18.

9. Manual for design of concrete and reinforced concrete structures of heavy concrete (without voltage), M.: stroiizdat, 1978, s-308.

The method of connection of prefabricated structures and elements with the use of inserts, wherein for the connection of precast concrete structures and elements use embedded parts, made in the form of a metallic casing of cylindrical shape, is placed in abutting concrete elements in the zone of the joint, the internal volume of which is pre-filled adhesive composition, and metallic bond, one end of which is slid into the metal ferrule of one of joined element and the other into the metal ferrule of the other abutting member, and the metal ferrule on the end of the paragraph is ivaran flange, the bore at an angle of 40-50° at a depth of 0.5-0.7 thickness of the flange with the transition to the cylindrical bore and the diameter of the metallic bond, which forms a funnel locking engagement, the ratio of the inner diameter of the shroud to the diameter of the connection is assumed to be

where dOC- inner diameter of the shroud;

dcthe diameter of the metallic bond,

this forms the contour emphasis in the area of the junction of the metal sleeve to the flange with the magnitude of the ledge not less than 5 mm in diameter connection 10-30 mm, which prevents the development of shear strain increases the compression and jammed metallic bond, and the length of the casing Laboutestimated to be equal to Labout=(10-12)dwithprecluding slippage of the connection.



 

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