Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

The present invention discloses a monolithic prefabricated construction method of post-tensioned prestressed concrete box grider, which mainly comprises the following steps: moulding board, reinforcing steel bar and embedded part installation, grider concrete packing, grider concrete steaming or natural maintenance, moulding removal, tension, and postorder construction, etc, wherein, the reinforcing steel bar adopts the technologies of centralized prewing, and overall hoisting, and the tension step adopts three tension techniques of pretension, first tension and final tension; the internal die adopts a hydraulic internal die system, and the grider concrete packing step adopts the construction proposal of concrete centralized mixing, and pipeline pumping pouring, which adopts a decentralized and continuous process, and pours gradually from two ends to the middle so as to realize one-though moulding. The construction method of the present invention is suitable for monolithic prefabricated ...

Box-beam steel bar centralized tying and integral hoisting construction method

The present invention relates to a pre-binding and lifting method of box girder reinforcing steel bars, in particular to a centralized pre-binding and integral lifting construction method of box girder reinforcing steel bars. The purpose of the present invention is to provide the centralized pre-binding and integral lifting construction method of the 32m/900t box girder reinforcing steel bars of a railway passenger-dedicated railway. In the applied technical scheme, the binding of the steel bars is carried out on a tire mould, wherein, a web plate is bound with a bottom plate, the bridge deck steel bars are separately bound, after an internal mold is assembled, the bridge deck steel bars are assembled and bound with the web plate and the bottom plate, and then the lifting is carried out by a box girder steel bar hoister. The present invention is mainly applied to the centralized pre-binding and the integral suspension setting construction of the 32m/900t box girder reinforcing steel bars ...

Post-tensioned method prestressed concrete box beam whole opening prefabricated construction method

600t supporting gravity type grouting construction method

A gravity grouting procedure of 600t support includes the steps of jack installing, bridge positioning, grout scaling, funnel, guiding tube and shuttle slot installing, grout mixing, grouting and strength testing. This procedure is especially applicable to the bridge construction for rails of passenger train.

Pretensioned beam whole opening prefabricated construction method

The present invention discloses a monolithic prefabricated construction method of pretensioned beam, the main working procedures of which comprise: construction preparation, bottom die adjustment, guide device and lateral die installation, hoisting bottom web reinforcement, end die and steel beam installation, threading steel strand and PVC pipe, hoisting internal die and deck reinforcement, firstly pulling of steel strand, finally pulling of broken line reinforcement, finally pulling of straight line reinforcement, grider concrete packing, grider concrete maintenance, loosening internal and lateral dies, broke line extension, cutting guide device, straight line reinforcement extension, hoisting steel beam, end and internal dies removal, hoisting grider, cutting wire and sealing anchor, etc. The construction method adopts straight line and broken line reinforcements, which is able to meet the demand of prefabricated construction of bridge with 32m / 900t big span and large tonnage; at the ...

32m/900t prestressed concrete pretension box beam static loading test method

Pretensioned prestressing box girder strain and relaxation process

32m/900t prestressed concrete pretension box beam static loading test method

The invention discloses a test procedure of 32m/900t pre stress pre open box girder concrete box, it includes building testing counter, laying test beam body, fixing balance weight and setting test equipment, and doing load test of three circulation by ordering step by step, and dong crack test for the 32m/900t pre open box girder effectively, splitting test and breaking test, dong experiment for the design of 32m pre open box girder, construct artwork, workmanship and the anti split and intensive properties of box girder.

Color semi-color tone micropoint coding method for high density information storage

The present invention relates to a halftone micropoint coding method for storing large volume of data. Said micropoint is produced on a base lining by means of high-resolution colour laser or ink-jetprinter or lithographic press. It adopts binary data coded data unit, and the combination of data units is fermed into a data block. Said invention uses external data unit to enclose data block, and to define data unit space, data block orientation and data unit reflectivity in the course of scanning and data reconstittuion. In said method, every byte possesses a parity check bit, and possesses the functions of error detection and correction.

600t supporting gravity type grouting construction method