CN103437448A - Telescopic joint device of maintenance-free steel composite material buckling restrained brace - Google Patents

Abstract

The invention discloses an expansion joint device supported by buckling restraint of maintenance-free steel composite material. The device comprises: a glass fiber reinforced resin material layer, a polyurethane foam layer; polyurethane foam, glass fiber cloth and resin are poured into a whole; A glass fiber reinforced resin material layer is set, a polyurethane foam layer is set inside the expansion joint, and the expansion joint is set on the supporting core steel core. The invention can adopt circular arc connection between the waveforms of the expansion joints, can effectively reduce the phenomenon of stress concentration, and has the characteristics of small rigidity, large flexibility, scalable type and strong deformation ability. The present invention adopts the one-time integral molding of the vacuum introduction process to ensure that the expansion joint and the support are taken as an integral structure, which has sealing performance while exerting flexibility, and meets the requirements of corrosion resistance and corrosion resistance.

Description

An expansion joint device for buckling-restrained bracing of maintenance-free steel composite materials

technical field

The invention belongs to the technical field of maintenance-free steel restraint supports, and in particular relates to an expansion joint device for buckling restraint supports of maintenance-free steel composite materials.

Background technique

The buckling restrained brace is mainly composed of the following three parts: the inner core stress unit (core material), the unbonded expandable material, and the buckling restraint unit. The constrained non-buckling section is composed of the constrained non-buckling section, which is also called the transition section. It is an extension of the constrained buckling section and needs to work in the elastic range. force, the axial force completely transitions to the constrained buckling section, so that the steel core can achieve tensile and compressive yield, and achieve the purpose of energy dissipation. And mortar (or concrete), there are also measures for welding stiffeners to increase the cross-sectional area, but when buckling-resistant restraints are used for outdoor structures such as tall steel towers and bridges.

The current structural measures to restrain the non-yielding section have more or less poor corrosion resistance, which is also the key part of the support for later maintenance, resulting in high maintenance costs.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a maintenance-free steel composite material buckling-restrained support telescopic joint device, aiming to solve the problems of poor corrosion resistance and high maintenance cost in the current construction measures for constraining non-yielding sections.

The embodiment of the present invention is realized in this way, a maintenance-free steel composite material buckling-constrained support expansion joint device, the maintenance-free steel composite material buckling-constraint support expansion joint device includes: expansion joints, glass fiber reinforced resin material layer, polyurethane foam layer;

Polyurethane foam, glass fiber cloth and resin are poured into a whole, a layer of glass fiber reinforced resin material is arranged on the outside of the expansion joint, the polyurethane foam layer is arranged inside the expansion joint, and the expansion joint is arranged on the steel core of the supporting core.

Further, a rectangular bellows-type polyurethane foam layer is used.

Further, a straight cut of 6-8 mm is set in the middle of the telescopic joint.

Further, the telescopic joint is set on the steel core of the supporting core through a straight cut.

Furthermore, the expansion joints and buckling restraint supports are molded at one time by vacuum introduction process.

Further, the specific steps of the vacuum introduction process are:

Put the core steel core, expansion joints, and the molded foam wrapped in glass fiber cloth into the mold covered with glass fiber cloth in sequence, lay glass fiber cover cloth on the surface of the component again, and lay out the mold on the surface of the glass fiber cloth in sequence Cloth, diversion cloth, spread spirally wound diversion tubes around, connect with vacuum pump, and lay vacuum bag, then vacuumize, introduce resin, after a period of time, after the resin is completely cured, remove the vacuum bag and take out the product And carry out trimming and grinding.

Further, the expansion joint can be set as a single-wave, double-wave, three-wave drum-shaped or rectangular bellows-type expansion joint.

Furthermore, the middle of the corrugations of the double-wave and triple-wave rectangular bellows-type expansion joints transitions through a circular arc.

Further, the expansion joint can be set as a rectangular or square expansion joint with no sharp corners at the ends of the obtuse sides of the four corners.

The expansion joint device supported by the buckling restraint of the maintenance-free steel composite material provided by the present invention can effectively reduce the phenomenon of stress concentration through the arc connection between the waveforms of the expansion joints, and can effectively reduce the phenomenon of stress concentration. powerful. The present invention adopts the one-time integral molding of the vacuum introduction process to ensure that the expansion joint and the support are taken as an integral structure, and have sealing performance while exerting flexibility, so as to meet the requirements of corrosion resistance and corrosion resistance. In addition, the invention has simple structure and convenient operation, and improves the performance of restraint support.

Description of drawings

Fig. 1 is a structural schematic diagram of an expansion joint device supported by buckling restraint of a maintenance-free steel composite material provided by an embodiment of the present invention;

Fig. 2 is a cross-sectional view of half an assembled expansion joint provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of a maintenance-free steel composite material buckling-constrained support with a double-wave expansion joint provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the maintenance-free steel composite material buckling-constrained support of the improved drum-type double-wave expansion joint provided by the embodiment of the present invention.

In the figure: 1. Expansion joint; 2. Glass fiber reinforced resin material layer; 3. Polyurethane foam layer; 4. Support core steel core.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1 and Figure 2, the expansion joint device supported by the buckling restraint of the maintenance-free steel composite material in the embodiment of the present invention is mainly composed of the expansion joint 1, the glass fiber reinforced resin material layer 2, the polyurethane foam layer 3, and the supporting inner core steel core 4 composition;

The outer side of the expansion joint 1 is provided with a glass fiber reinforced resin material layer 2, the polyurethane foam layer 3 is provided inside the expansion joint 1, and the expansion joint 1 is provided on the supporting core steel core 4;

The principle of the maintenance-free steel composite material buckling-constrained support telescopic joint of the present invention: based on the stress mechanism of the buckling-resistant constrained support, the telescopic joint 1 of the present invention has the characteristics of small rigidity, high flexibility, and scalability, and can be deformed in tension and compression At the same time, it has deformation ability to ensure that the steel core 4 of the supporting core is fully stressed, and the externally constrained FRP ribs are basically not affected by the axial force and only play a restraining role. Ensure that the expansion joint 1 and the support work together as a whole, and have integrity and sealing while exerting flexibility;

As shown in Figure 2, the telescopic joint 1 of the present invention is a single-wave rectangular bellows, and this telescopic joint is used as a transition section, which utilizes the characteristics of small axial stiffness to give full play to its deformation ability and prevent the axial force from being transmitted to the peripheral constraining unit; The outside is a glass fiber reinforced resin material layer 2, and the inside is filled with a rectangular bellows-type polyurethane foam layer 3. This foam is insoluble in unsaturated polyester resin and can be cast into a whole with glass fiber cloth and resin. The middle of the single-wave expansion joint is designed with a word Type incision, the size of the incision is 6-8mm, which is convenient to embed into the end of the steel core. During the specific operation, the single-wave expansion joint is divided into two parts from the middle, and embedded into the support core steel core 4 from the top and bottom to complete the assembly;

The telescopic joint 1 of the present invention is a double-wave rectangular bellows. As a transition section, the telescopic joint has half the axial stiffness and twice the deformation capacity of the single-wave rectangular bellows. The double-wave telescopic joint has better telescopic performance than the single The wave expansion joint; the double wave expansion joint has an outer glass fiber reinforced resin material layer 2 and a rectangular bellows-type polyurethane foam layer 3 inside.

The expansion joint of the present invention can be a rectangular (square) expansion joint with four obtuse sides, and the end has no sharp corners, which can reduce the influence of stress concentration. As an improvement, in order to reduce the end and local stress concentration, a drum can also be designed Bellows-shaped expansion joints can be designed with single-wave, double-wave, and three-wave drum-shaped bellows expansion joints. Arc transitions are used between waveforms to further reduce stress concentration, and different sizes of expansion joints can be designed using the designability of expansion joints 1. Section, see Figure 4, as an improvement to reduce the number of expansion joints 1, it can be designed to place one expansion joint 1 in the middle of the support.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (9)

1. An expansion joint device supported by buckling restraint of maintenance-free steel composite material, characterized in that, the expansion joint device supported by buckling restraint of maintenance-free steel composite material comprises: expansion joint, glass fiber reinforced resin material layer, polyurethane foam layer, Support core steel core; Polyurethane foam, glass fiber cloth and resin are poured into a whole, a layer of glass fiber reinforced resin material is arranged on the outside of the expansion joint, the polyurethane foam layer is arranged inside the expansion joint, and the expansion joint is arranged on the steel core of the supporting core. 2. The expansion joint device supported by buckling restraint of maintenance-free steel composite materials according to claim 1, characterized in that, a rectangular bellows-type polyurethane foam layer is used. 3. The expansion joint device supported by buckling restraint of maintenance-free steel composite material according to claim 1, characterized in that, a straight cut of 6-8 mm is arranged in the middle of the expansion joint. 4. The expansion joint device of the maintenance-free steel composite material buckling restraint support according to claims 1 and 3, characterized in that the expansion joint is arranged on the support inner core steel core through a straight cut. 5. The expansion joint device of the maintenance-free steel composite material buckling-constrained support according to claim 1, wherein the expansion joint and the buckling-constrained support are formed at one time by a vacuum introduction process. 6. The expansion joint device supported by buckling restraint of maintenance-free steel composite materials as claimed in claim 5, wherein the specific steps of the vacuum introduction process are: Put the core steel core, expansion joints, and the molded foam wrapped in glass fiber cloth into the mold covered with glass fiber cloth in sequence, lay glass fiber cover cloth on the surface of the component again, and lay out the mold on the surface of the glass fiber cloth in sequence Cloth, guide cloth, spread spirally wound guide tubes around, connect with vacuum pump, and lay vacuum bag, then vacuumize, introduce resin, after the resin is completely cured, remove the vacuum bag, take out the product and trim it Grinding treatment. 7. The expansion joint device supported by buckling restraint of maintenance-free steel composite material according to claim 1, characterized in that the expansion joint can be set as a single-wave, double-wave, triple-wave drum-shaped or rectangular bellows-type expansion joint. 8. The expansion joint device supported by buckling restraint of maintenance-free steel composite material according to claim 7, characterized in that the corrugations of the double-wave and triple-wave rectangular bellows-type expansion joints are transitioned through circular arcs. 9. The expansion joint device supported by buckling restraint of maintenance-free steel composite material according to claim 1, characterized in that the expansion joint can be set as a rectangular or square expansion joint with four obtuse sides without sharp corners.

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