A Pre-tensioned Prefabricated Beam-Slab Tension Pedestal Structure

Abstract

The invention discloses a pre-tensioned prefabricated beam slab tension platform structure, which comprises a first tension anchor end, an enlarged foundation, a bottom mold frame, a bender, a second bogie and a second tension anchor end. The pile structure is adopted, the horizontal tension of the prestressed steel strand is transmitted through the enlarged foundation, the overturning bending moment at the tension end is borne by the pipe pile under the enlarged foundation, and the uplifting force of the bender is also offset by the self-weight of the enlarged foundation, maximizing savings The amount of concrete and steel for the pedestal is reduced; the structure can prefabricate two beams at the same time when the steel strand is stretched once, which can reduce the number of tensions, speed up the construction efficiency of beams and slabs, reduce the investment of tension end pipe piles, and reduce the occupied area of ​​the site. The pulleys of the first bogie and the second bogie use roller inner sleeve bearings, which effectively reduces the prestress loss of the steel strands. The reaction wall, diagonal braces, anchor trolleys and bogies are all made of steel structures to ensure their own strength and rigidity. Under the premise of this, it can also realize the secondary use of the structural transition.

Description

technical field [0001] The invention relates to the field of prefabricated beam slabs for bridge construction, in particular to a pretensioned prefabricated beam slab tensioning platform structure. Background technique [0002] In the prestressed structure, the pretensioned structure has simple process, good durability, and no stress concentration under the anchor, which has incomparable advantages over the posttensioned method; but most of the pretensioned structures adopt the linear reinforcement method, which seriously limits It spans capabilities and range of applications. For this reason, the prestressed tendons can be arranged in the form of folded lines bent at both ends during construction to form a new structure of "prestressed concrete pre-tensioned beam with broken line reinforcement"; the tensioning pedestal is the realization of this new structure key structure. [0003] At present, most of the pretensioned pedestals used in engineering are pier pedestals, whi...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a pre-tensioned prefabricated beam slab tension platform structure: by first driving the pipe piles into the foundation, then making an enlarged foundation on the top of the pipe piles, and then placing the bottom form The frame, the bender, the second bogie, the diagonal bracing of the first tension anchor end, the first tension anchor end, the reaction wall of the second tension anchor end, the first bogie and the expanded foundation are poured together, and the first The prestressed steel strand passes through the top of the bender, and one end of the second prestressed steel strand passes through the pulley of the first bogie at the first tension anchor end and is anchored on the anchor trolley. The second prestressed steel strand The other end of the first prestressed steel strand is connected to the first prestressed steel strand through a steel strand connector, the third prestressed steel strand is passed through the second bogie, and the other end of the first prestressed steel strand is passed through a steel strand connector Connected with the third prestressed steel strand, the other end of the third prestressed steel strand is connected to the pulley of the first bogie at the second tensioned anchorage end through the steel strand connector and then anchored on the anchor trolley, and the jack starts to work , drive the pull rod to move synchronously for tensioning, so that the anchoring trolley is driven to move to realize the tensioning of the steel strand. After the tensioning is in place, tighten the jack feet to realize the prestressed tensioning. Use jacks for hypertensioning, and then loosen the jack feet to realize prestress release, which solves the problem that the existing pre-tensioning pedestals mostly use pier-type pedestals, and use their own weight to balance the tension. This kind of structure is often made relatively large. The foundation has high requirements and occupies a large space. After pouring a certain number of beams and slabs, the foundation will often be deformed, which seriously reduces the accuracy and safety of the pre-tensioned beams. Each beam must be stretched and untensioned separately. High manpower and power consumption, not suitable for large-scale construction

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