6 results about "Box girder" patented technology

The invention discloses a construction method of mutilevel overpass scaffold, comprising the following steps: building a bottom layer scaffold provided with steel frame doorways for vehicles and pedestrians to pass, checking and installing a deformation monitoring system, and carrying out a load pressure test on the bottom layer scaffold; building at least two layers of bridge scaffolds on the bottom layer scaffold, building box girder doorways for bridge construction on the bridge scaffold, installing the deformation monitoring system on the box girder doorway and carrying out comprehensive load test. The bottom layer scaffold is provided with the steel frame doorway so as to meet the passing demand of big traffic flow; each layer of the middle part can be provided with the mutually crossed box girder doorways in the same plane and can be provided with the mutually crossed box girder doorways in the vertical direction, therefore optionally carrying out construction according to requirements; the whole scaffold only needs to be built and removed once, not only shortening the building and removing time of the scaffold but also reducing the risk of building and removing the scaffold; and each level of bridge can be constructed at the same time, and therefore, the construction period is short and the construction cost is low.

The invention discloses a fully-assembled prefabricated concrete girder bridge superstructure and further provides a construction method of the fully-assembled prefabricated concrete girder bridge superstructure. The fully-assembled prefabricated concrete girder bridge superstructure comprises prefabricated concrete box girder single bodies, prefabricated concrete guardrails and a bridge deck paving layer. The prefabricated concrete box girder single bodies comprise prefabricated concrete box girder bodies; flange plates are arranged on the two sides of top plates of the prefabricated concretebox girder bodies; transverse splicing rigid prefabricated pieces are pre-embedded in the flange plates; the prefabricated concrete box girder single bodies further comprise transverse partition plates, and transverse partition plate splicing rigid prefabricated pieces are pre-embedded in the transverse partition plates; longitudinal splicing rigid prefabricated pieces are pre-embedded in the twoends of the prefabricated concrete box girder bodies; the adjacent prefabricated concrete box girder single bodies are transversely and longitudinally spliced; and the prefabricated concrete guardrails are connected with the prefabricated concrete box girder single bodies, and guardrail locking nuts are assembled on guardrail connecting bolts. Through the structure, cast-in-place concrete and negative moment prestressed ribs of the prefabricated concrete girder bridge superstructure in the connecting construction process can be omitted, and all components of the superstructure are fully assembled.

The invention provides a water vapor generating system for curing of a prefabricated box girder, belongs to the technical field of curing of prefabricated box girders, and solves the technical problems that the existing spraying distance is not fixed, the spraying uniformity is poor, the curing quality is influenced and the like. The water vapor generating system for maintenance of the prefabricated box girder comprises two moving trolleys, moving wheels are arranged at the lower ends of the moving trolleys, a steam generating mechanism is arranged in the moving trolleys, a connecting base is arranged at the upper ends of the moving trolleys and connected with the steam generating mechanism, and a vertical spraying pipe is connected to the connecting base. The upper end of the vertical spraying pipe communicates with a transverse spraying pipe, and positioning mechanisms are arranged on the opposite faces of the two moving trolleys correspondingly. The spraying device has the advantages that the moving path of the moving trolley is limited, it is guaranteed that the distance between the spraying mechanism and the prefabricated box girder is not changed, and therefore spraying uniformity is guaranteed, and the maintenance quality is improved.

The invention discloses a prestressed steel-concrete combined box girder suspension splicing construction device which comprises a support, the support is provided with a first girder section, a second girder section and a second girder end which are symmetrically hoisted, the second girder end adopts a finish rolling deformed steel bar anchoring device, and two steel boxes are welded and spliced to enable the first girder section and the second girder section to form a cantilever structure. A first connecting hole and a second connecting hole are formed in a finish rolling deformed steel bar. The finish rolling deformed steel bar is used as a prestressed steel bar in the sectional suspended splicing construction stage of the steel box girder. The second girder ends are symmetrically hoisted and accurately positioned. According to the construction method, the finish-rolled deformed steel bars are adopted as prestressing force to conduct cantilever assembly construction on the open steel box girders, and the construction difficulty is small; the cantilever construction without traffic blocking is convenient; and the device has the advantages of saving construction temporary facilities and saving construction cost.