41results about How to "Improve static strength" patented technology

The present invention relates to a plant for the continuous degassing of reaction products from carboxylic or dicarboxylic acids comprising a multifunctional alcohol, which can be used to produce intrinsic viscosities up to 0.9 dl / g. The inlet of the product in the reactor is distributed via a plurality of slit nozzles onto the reaction surface in the inlet part before flowing into the tank and an additional preactivated formation of the necessary reaction surface of the product is achieved by means of the product receiving device. The reactor comprises a plurality of reaction zones, which are driven by separately acting rotors with respective associated hydraulic systems, each hydraulic system being installed outside the reactor. In this case the measured values ​​from the behavior of the hydraulic system are used to control the reaction of the product in order to influence the attainment of predetermined product parameters and qualities. Reactors have one or more individual product discharges depending on the product properties to be achieved.

The invention discloses an expandable air barrier device and a method of using the same for injection remediation of underground water pollution. The expandable air barrier device comprises a main air injection pipe, a rubber cylinder assembly made of elastic materials is sleeved to the middle of the main air injection pipe, and a group of rubber cylinder connectors, protection sleeves, middle connectors and connecting sleeves are symmetrically sleeved on the upper portion and the lower portion of the rubber cylinder assembly of the main air injection pipe. The connecting sleeve I is connected between the middle connector I and the upper connector, the upper connector is provided with an upper port used for connecting the main air injection pipe with an external air injection pipe, an inflating port is arranged beside the upper port, the upper end of the inflating port is connected with an external inflating pipe, and the lower end of the inflating port extends downward to be communicated with an air injection cavity. Quick and one-way air injection in an air injection well can be guaranteed by means of the expandable air barrier device and the method, and the requirements of large-scale in-situ remediation of underground water in volatile organic pollutant areas by air injection technique can be met. Further, the expandable air barrier device and the method promote development of the underground water air injection technique and have wide application prospect.

The invention provides a method for reinforcing steel pipe joints by upward movement of a groove-shaped collar plate. A branch pipe is perpendicularly welded at the middle position of the top surface of a main pipe with the reinforced joints; the groove-shaped collar plate is welded on a pipe body of the branch pipe in a sleeving manner and is welded on two sides of the main pipe with the reinforced joints in the direction of the axis of the main pipe or in the direction perpendicular to the axis of the main pipe or welded on the upper surface of the main pipe with the reinforced joints, so that a surrounding welded joint, a center connecting welded joint and a double-side connecting welded joint are formed; and when the groove-shaped collar plate is arranged in the direction of the axis of the main pipe with the reinforced joints and the width of the surface of the main pipe with the reinforced joints difficultly guarantees welding of the double-side connecting welded joint, a flange of the groove-shaped collar plate can be welded with the side wall of the main pipe with the reinforced joints. The method for reinforcing the steel pipe joints by upward movement of the groove-shaped collar plate is not only suitable for reinforcement, repairing and strengthening of the steel pipe joints during service period, but also is suitable for machining the reinforced joints of steel pipe structures in the design stage. In the method, the collar plate and the welded joints of the branch pipe move upwards, the static strength of the joints can be improved, the welded joints of the main pipe and the branch pipe can be protected, brittle failure of the welded joints is avoided, and therefore, the anti-seismic ductility performance of the welding joints is improved.

The invention relates to a device for continuously degasifying reaction products of a carboxylic acid or dicarboxylic acid with a multifunctional alcohol, which can be used for creating intrinsic viscosities of up to 0.9 dl / g. The product is distributed onto the reaction area located in the inlet section via slot nozzles (16) at the inlet into the reactor before running down to the bottom while required reaction surface of the product is additionally created in a proactive manner by means of a product receiving device (17). The inventive reactor is composed of several reaction zones which aredriven by separately operated rotors encompassing associated hydraulic systems, respectively, said hydraulic systems being installed outside the reactor. Measurable variables from the mode of operation of the hydraulic systems are used for controlling the reaction of the product in order to influence the obtention of predefined product parameters and qualities. The reactor is provided with one orseveral individual product outlets according to the product properties that are to be obtained.