Expansion joint for engineering structures

 

(57) Abstract:

The invention relates to the field of construction and repair of engineering structures, particularly bridges. Expansion joint for engineering structures consists of a base layer of elastic material with two grooves on the outer surface and one on the inner side layer and inside layer of the metal fitting and protective rubber layer. Bearing and protective rubber layers is made of rubber based on butyl rubber and propylenoxide rubber percentage 5-15: 85-95, respectively. The technical result provided by the present invention is to provide a high low-temperature operating characteristics in combination with high resistance rubber layers to aggressive environments and high strength of their attachment to the metal fixture after vulcanization. 2 Il., table 1.

The invention relates to the construction and maintenance of engineering structures, particularly bridges.

Known expansion joint for bridges and other engineering structures containing a supporting layer of elastic material is made of rubber based on natural, bout the Rennie side layer and inside layer of the metal fitting and protective rubber layer of the rubber based on polychloroprene rubber. (1)

The disadvantage of this expansion joint for bridges and other engineering structures is poor low-temperature performance.

Known expansion joint for bridges and other engineering structures containing a supporting layer of elastic material is made of rubber based on ethylene-propylene rubber, with the two grooves on the outer surface and one on the inner side layer and inside layer of the metal fitting and protective rubber layer of the rubber based on polychloroprene rubber. (2)

The disadvantage of this expansion joint for bridges and other engineering structures is poor low-temperature performance.

The aim of the invention is to improve low-temperature performance characteristics temperature seam for engineering structures.

This goal is achieved by the fact that the expansion joint for engineering structures containing a supporting layer of elastic material with two grooves on the outer surface and one on the inner side layer and inside layer of metal Arna using a combination of butyl rubber and propylenoxide rubber percentage 5-15:85-95, respectively.

In Fig. 1 shows in cross-section expansion joint for engineering structures with metal reinforcement in the form F-aversnogo profile. In Fig. 2 - the same with P-shaped profile.

Expansion joint for engineering structures contains supporting layer 1 made of elastic rubber material with the two grooves on the outer surface 2 and one on the inner side of the layer 3 and the metal fitting 4, which is located inside the layer, and the protective rubber layer 5. Bearing and protective rubber layers is made of rubber based on a combination of butyl rubber (BK) and propylenoxide rubber (BOCOG) as a percentage 5-15:85-95, respectively. Metal fittings lined with rubber leaves the base layer, then put the rubber sheets of the protective layer. After such Assembly, the resulting billet is placed in a mold and vulcanized in a press under heat and pressure. Upon completion of the vulcanization process finished expansion joint for engineering structures extracted from the mold.

Low-temperature performance characteristics temperature seam for engineering structures was assessed by the coefficient of reliability (KN) at room temperature and -40the Board is retaining full sectional fragments of length 350 mm of expansion joints for engineering structures, made the prototype and according to the invention. Tests were carried out at a temperature joints for engineering structures with a nominal elongation of 25 mm, which is installed for this type of expansion joint for engineering structures. Device for testing consisted of a horizontal tensile machine with a special fixture for sample expansion joints for engineering structures. Prior to the test at -40oC samples pre-aged for 48 h in the refrigerating chamber at a given temperature. Fixed samples expansion joint was stretched in the device for testing to failure, fixing the elongation at fracture. KN was calculated by the formula

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The resistance of the protective rubber layer to aggressive environments was assessed by the change in mass of the rubber sample after swelling in standard liquid Nepomnyashchy-1 at 70oC for 24 h in accordance with GOST 9.030-74.

The strength of attachment of the rubber layer to a metal armature after vulcanization was determined according to GOST 209-75.

The test results of samples of expansion joints for engineering structures are presented in the table, from which one can draw the following conclusion examples (5-6), have higher values of the safety factor at room and low temperatures compared to thermal seam for engineering structures, fabricated prototype (1).

2. Rubber layers the temperature of the weld made according to the invention (2-4) and reference example (6), have a higher resistance to aggressive environments compared to rubber layers manufactured according to the control example (5).

3. Rubber layers the temperature of the weld made according to the invention (2-4) and reference example (5), have a higher strength of attachment to the metal fixture after vulcanization compared to rubber layers manufactured according to the control example (6).

4. Because the compositions are mapped rubber layers for the temperature of the weld containing a combination of butyl rubber and propylenoxide rubber according to the invention (5-6), the same made a positive effect is achieved only through the application of a combination of butyl rubber and propylenoxide rubber in proportions according to the invention.

5. High low temperature performance characteristics of expansion joints for engineering structures in combination with a symbolic value for the valve after vulcanization can be obtained only by using technical solutions according to the invention.

Bibliography:

1. Patent Germany N 2709708, E 01 D 19/06, 1981.

2. Patent Yugoslavia N 39087, E 01 D 19/06, 1984.

Expansion joint for engineering structures containing a supporting layer of elastic material with two grooves on the outer surface and one on the inner side layer and inside layer of the metal fitting and protective rubber layer, characterized in that the carrier and protective rubber layers is made of rubber based on a combination of butyl rubber and propylenoxide rubber percentage: 5 to 15 : 85 to 95, respectively.

 

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