49results about How to "Engineering quality is easy to control" patented technology

Belonging to the field of cement production and also relating to the field of building materials, the invention provides a high early strength and high corrosion resistant Portland cement and a preparation method thereof. The high early strength and high corrosion resistant Portland cement is mainly applied to engineering projects in complex marine environments and the west harsh environments. The high early strength and high corrosion resistant Portland cement is characterized by containing, by weight percentage, 60%-90% of a high iron and low calcium cement clinker mineral component, 2%-10% of an auxiliary functional component, 5%-25% of an auxiliary cementitious component, and 3%-7% of industrial gypsum. The high iron and low calcium cement clinker mineral component is mainly prepared from high iron and low calcium Portland cement clinker and high iron and low calcium Q phase cement clinker in a mass ratio of 5-15:1. The cement not only has strong seawater erosion resistance and high early strength, but also has the characteristics of low shrinkage and low hydration heat.

The invention discloses a prefabricated assembly well wall structure and a construction method thereof. The prefabricated assembly well wall structure is formed by splicing and assembling a plurality of prefabricated pipe pieces in the longitudinal direction and the annular direction; a plurality of prestress through holes penetrating through the upper end and the lower end, a plurality of grouting holes and a plurality of slurry discharging holes are formed in each prefabricated pipe piece at intervals; a prestress connecting element is arranged in each prestress through hole, and extends out from the upper end and the lower end of the corresponding prestress through hole; inclined inner holes are formed in two ends of the annular direction of the inner side of each prefabricated pipe piece; an inclined connecting sleeve is embedded in each inclined inner hole; and a force transmission bushing and a water stop structure are arranged between two prefabricated pipe pieces which are adjacent in the longitudinal direction and the annular direction. The prefabricated assembly well wall structure is formed by splicing the prefabricated pipe pieces; the vertical shaft foundation pit excavation enclosure exposure time is reduced; the complicated process of a wet construction work procedure is simplified; the work intensity of workers is reduced; the construction speed is high; the cost and the manufacturing price are low; the environment pollution is low; and good social effects and economic effects are achieved.

The invention provides a dry-soil-removed reinforced concrete screw pile forming device. The dry-soil-removed reinforced concrete screw pile forming device comprises a steel mould pipe, wherein the steel mould pipe penetrates through a base of a piling machine, and is provided with an external helicoid, a rotating power head is arranged at the upper end of the steel mould pipe, a cross-shaped connector is arranged at the lower part of the steel mould pipe, a steel hoop is welded to the top end of the steel mould pipe, a notch is formed at one end of the steel hoop, and is matched with the cross-shaped connector, clamps are arranged between the steel hoop and a base of the rotating power head, and can be connected with each other to form a whole, and an auxiliary rotating power device is arranged at the middle part of the steel mould pipe. A pile forming method comprises the following steps of: firstly, arranging the steel mould pipe in place, starting the power head to screw the steel mould pipe into a soil layer, starting the auxiliary rotating power device to a designed elevation in the case that the steel mould pipe enters a hard soil layer, completely removing soil in the steel mould pipe, putting a reinforcing cage into the steel mould pipe, grouting and filling concrete into the steel mould pipe, and inversely rotating the power head to check height of the concrete in the steel mould pipe so as to ensure dimension of the external helicoids of the pile until the steel mould pipe gets away from the soil layer, so that a screw pile is formed. The dry-soil-removed reinforced concrete screw pile forming device and the pile forming method provided by the invention have the advantages of high bearing capacity, high pile forming quality, environment friendliness and energy-saving performance, and is particularly applicable to a deep soft soil layer and a flat-bottomed screw pile.