A Shear Strengthening Method for Hollow Slab Beams Based on High Performance Composite Materials

Abstract

The invention discloses a shear reinforcement method for hollow slab girders based on high-performance composite materials. Open pouring holes on the roof of the reinforced section of the slab girder, chisel the concrete in the cavity of the reinforced section of the hollow slab beam through the pouring hole, and then seal the two ends of the cavity of the reinforced section of the hollow slab beam; Step 3: Drill and plant reinforcement holes, Plant shear reinforcement in the reinforcement hole; Step 4: Spray water on all existing concrete surfaces that need to be poured; Step 5: Use high-performance micro-expansion self-compacting concrete to pour from the pouring hole; Step 6: On the bridge deck Pave the reinforced mesh at the position of the leveling layer; step 7: pour the leveling layer with high-performance shrinkage-compensating concrete; step 8: pave the asphalt layer and open the traffic. The shear bearing capacity, shear stiffness and fatigue resistance of the reinforced structure of the invention are greatly improved.

Description

technical field [0001] The invention relates to the technical field of high-performance composite materials and bridge maintenance and reinforcement, in particular to a shear reinforcement method for hollow plate girders based on high-performance composite materials. Background technique [0002] Concrete hollow slab girders are widely used in bridge construction. Its advantages are light weight, low cost, mature manufacturing process and convenient installation. [0003] In recent years, with the rapid development of transportation, material aging, environmental erosion, long-term load effects, fatigue effects, mutation effects, and coupling with natural disasters such as earthquakes and typhoons, it will inevitably lead to damage accumulation and resistance of bridge structures. Attenuation, thereby reducing its normal use function and safety performance, and in extreme cases, it is very easy to cause catastrophic accidents. For the widely used hollow slab girder bridges,...

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Problems solved by technology

However, these reinforcement methods have certain limitations, which are not applicable in actual engineering.

Among them, the ordinary method of enlarging the section, whether it is enlarging the section at the top of the beam or at the web, will have problems such as long construction period, poor bonding ability of new and old concrete, and easy to cause secondary damage; the transverse bonded steel reinforcement method is used Adhesives and anchor bolts are used to paste and anchor the steel plate transverse bridge vertically to the bottom of the beam, relying on the steel plate to bear the role of horizontal connection. Under repeated loads, it is easy to cause the steel plate to separate from the concrete. In addition, the damage of the hinge joint will cause rainwater erosion and the reinforcement effect Gradually decline, and the transverse bonded steel reinforcement method mainly improves the horizontal connection of the bridge, and the improvement of the shear bearing capacity is limited; the bonded carbon fiber cloth reinforcement technology is difficult to guarantee the bonding effect of the base material under large loads, and the single use of this material The improvement of the shear bearing capacity of reinforced shear bridges is negligible; the construction of external prestressed reinforcement is more complicated, the cost is high, the anchors are easily damaged, and the appearance effect is poor

The above reinforcement methods have their own disadvantages, and their effectiveness in practical engineering is limited.

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