Temporary prestressing device for segment prefabricated assembled beam

Abstract

The invention discloses a temporary prestressing device for a segment prefabricated assembled beam. The temporary prestressing device comprises adjacent spliced prefabricated segments, the prefabricated segments are provided with temporary tensioning pedestals, the temporary tensioning pedestals include anchor plates for temporary prestress steel bars to penetrate through, and the temporary prestress steel bars are anchored to the anchor plates by nuts. Rib plates are arranged on the back parts of the anchor plates, and bottom plates are arranged at the lower ends of the anchor plates and thelower ends of the rib plates. The temporary tensioning pedestals can be removed and used repeatedly, the material utilization amount is reduced, and the weights of the segments are reduced. Accordingto the temporary prestressing device, sleeves are pre-embedded in the prefabricated segments of a concrete beam, and holes are not required to be formed in formworks so as to ensure the integrity of the formworks and reduce the types of the formworks. The number of the sleeves of the temporary prestressing device is small, sleeve bolt holes are convenient to seal, and therefore the risk of water seepage of a bridge deck during operational period is reduced. Positioning steel plates of the temporary prestressing device are buried in concrete, the surface of the structure is leveled by rubber plates, no leveling steel plates are needed, and the laying of a waterproof layer of the bridge deck is facilitated.

Description

technical field [0001] The invention belongs to the field of bridge structure construction, in particular to a temporary prestressing device for segmental prefabricated assembled beams. Background technique [0002] During the construction of prestressed concrete beams by the segmental prefabricated assembly method, a certain temporary preload needs to be applied to the adhesive joints between the prefabricated segments, so that the epoxy resin sealant can be cured under pressure. At present, the anchoring methods used to apply temporary prestress mainly include concrete anchor blocks, movable steel pedestals with pre-embedded U-shaped anchor bolts, and movable steel pedestals with reserved anchorage channels. Concrete anchor blocks cannot be reused and increase material cost and structural weight. The movable steel pedestal of the pre-embedded U-shaped anchor bolts, the U-shaped anchor bolts protrude from the surface of the precast concrete segment, and holes need to be dr...

AI Technical Summary

Problems solved by technology

Concrete anchor blocks cannot be reused and increase material cost and structural weight

The movable steel pedestal for the pre-embedded U-shaped anchor bolts, the U-shaped anchor bolts protrude from the surface of the precast concrete segment, and holes need to be drilled at the corresponding positions of the formwork, which affects the integrity of the formwork, and the position of the temporary tensioning pedestal of each precast segment May be inconsistent, increase template types

The removable steel pedestal with anchoring channels reserved, the workload of channel sealing in the later stage is relatively large, and improper channel sealing is prone to water seepage

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