Pre-tensioning precast beam plate stressing bed structure

Abstract

The invention discloses a pre-tensioning precast beam plate stressing bed structure. The pre-tensioning precast beam plate stressing bed structure comprises first stressing anchor ends, a spread foundation, bottom die frames, benders, second bogies and second stressing anchor ends. The structure is a pile column type structure, horizontal tension of prestress steel strands is transmitted through the spread foundation, the overturning moment of a stressing end is borne by pipe piles below the spread foundation, and the upward pulling force of the benders is also counteracted by the dead weightof the spread foundation, so that the using amount of pedestal concrete and steel is saved to the maximum extent; according to the structure, two beams can be precast at the same time by stressing thesteel strands once, so that the stressing frequency can be reduced, the beam plate construction efficiency can be improved, the investment of the pipe piles at the stressing end can be reduced, and the occupied area of a site can be reduced; pulleys of a first bogie and the second bogies adopt roller inner sleeve bearings, so that the prestress loss of the steel strands is effectively reduced; and a reaction wall, an inclined strut, an anchoring trolley and the bogies are all of steel structures, so that secondary use in tectonic stress field transformation can be achieved on the premise thatthe strength and rigidity of the reaction wall, the inclined strut, the anchoring trolley and the bogies are guaranteed.

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...

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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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