49results about How to "Guaranteed long-term security" patented technology

The invention relates to a device and the method for detecting the prior project quality. The anchorage cable long-term pre-stress state and the bearing performance are detected through the specific stretching program and the technical proposal; aiming at the situation of the most prior anchorage projects that the steel stranded wires at the end of the anchorage cable end are sheared off, a device for detecting the prior anchorage project quality is designed in the invention, the residual steel stranded wires at the end of the anchorage cable is prolonged and then stretched, and the project quality is detected according to the detection method of the invention, and through the adopting of the device, the stretching force is reinforced to the prior anchorage project which pre-stress is lost; therefore the invention solves the problem of the post-stage detecting of the drawing force of the anchorage section of the prior anchorage project that the long-term quality hidden danger of the anchorage project is found in advance and prevented, and the invention guarantees the long-term security of the anchorage project and provides an effective solving method.

The invention discloses a method for monitoring the abnormal air volume of a fan in an oil-immersed transformer cooling system based on oil index identification. The method includes establishing the temperature rise of the oil-immersed transformer under two cooling modes: oil-immersed self-cooling and oil-immersed air cooling model, calculate the top layer oil temperature of the transformer, and compare the transformer oil index in the two modes, so as to obtain the characteristic quantity reflecting the state of the fan air volume. The monitoring method reflects the running state of the fan by monitoring the change trend of the transformer oil index in real time according to the on-site oil temperature data of the transformer. As an abnormal state monitoring method for fans in the cooling system, this method uses transformer oil temperature data to conduct real-time and continuous online monitoring of fan air volume conditions, which can make up for the shortcomings of existing regular manual detection methods for fans, and greatly improve the efficiency of early fan fault detection. and accuracy.

The invention relates to walls, roof surfaces, and stilt floor slabs of industrial and civil buildings, in particular to a construction method for control insulation layers of step type equal height insulation laths. The invention is characterized in that the step type equal height insulation laths are connected on a base course wall through bonding agent to form reference control, then a polyurethane hard foam insulation layer is spray coated and a slurry material insulation layer is applied between two step type equal height insulation laths, so as to realize the effective control of the layer thickness and the overall thickness of the insulation layers. The polyurethane hard foam insulation layer is spray coated according to the height of a first step H1 of the step type equal height insulation laths, and the slurry material insulation layer is applied according to the height of a second step H2 of the step type equal height insulation laths. The width of the step type equal height insulation laths is 70 to 120 mm. The invention has the advantages that the application of the step type equal height insulation laths realizes the effective control to the thickness of the two insulation materials in the construction process; after the polyurethane hard foam insulation layer is spray coated, the surface is not required to be finished, thereby the labor intensity is reduced, the working time is saved and the environment pollution caused by construction waste generated by finishing the surface is reduced; the insulation layers have good insulation integrity and consistent thermal performance, edge joints and a hot bridge effect of large thickness insulation layers of EPS, etc. can be avoided, and the high efficiency and the energy conservation can be realized.

A dithiocarbamate functionalized dendrimer with an alkylenediamine core, a dithiocarbamate pendant functional group and a dithiocarbamate end functional group, as a soil heavy metal immobilization amendment, and a preparation method thereof are provided. The dithiocarbamate functionalized dendrimer has a chemical formula of (CH2)a{N[CH2CH2COOCH2C(C2H5)(CH2OCOCH2CH2N(CSSM)CH2(CH2)bCH2N(CSS M)2)2]2}2, wherein a is a positive integer larger than 2; b is a positive integer at a range of 0-4; and M is Na+, NH4+ or K+. The dithiocarbamate functionalized dendrimer with the alkylenediamine core is used for an in-suit immobilization remediation for soil contaminated by heavy metals, and has advantages of a small dosage, high efficiency, safety and rapidness. The dendrimer is able to effectively immobilize exchangeable and carbonated bound forms of the heavy metals, in such a manner that the immobilized heavy metals are able to resist an influence from natural environment for a long term, such as an acid rain.