5 results about "Soil frost" patented technology

The invention provides a power grid multi-disaster coupling strength calculation method and system, and relates to the technical field of power emergency, and the method comprises the steps: collecting the weather forecast data of a target power transmission channel and the real-time operation parameters of a power grid; analyzing weather forecast data, and configuring virtual monitoring points at the midpoint of an ice-prone section of a line, the tower top of a tower in a thunder and lightning frequent area and the geometric center of a tower foundation in a soil frost heaving sensitive area; generating a dynamic feature point set based on the virtual monitoring points; analyzing real-time operation parameters of a power grid, and collecting an equipment state feature point set at monitoring points at four corners of a tower foundation platform, a joint of an insulator steel foot and a hanging point and an outlet of a wire strain clamp; and extracting a data point sequence with time-space continuous evolution characteristics in the dynamic characteristic point set as a core trajectory for constructing the three-dimensional dynamic ellipsoid. The method can improve the dynamic nature and accuracy of power grid risk assessment under the disaster chain effect, and guarantees the safe operation of a power transmission channel.

This invention relates to the field of soil frost heave characteristic testing technology, and particularly to an improved soil frost heave characteristic testing device and method, comprising an acrylic mold, wherein several threaded holes are respectively opened on both sides of the acrylic mold along its height direction, and a special hole bolt is threaded into the threaded holes. The special hole bolt includes a bolt part and a flared mouth with an integral structure. A circular hole is opened in the middle of the bolt part, and the flared mouth is threaded on the outside. A matching rubber stopper is installed in the middle of the flared mouth. The matching rubber stopper is frustoconical and is divided into four equal parts. The matching rubber stopper fits tightly with the flared mouth. The contraction of the flared mouth causes the middle hole of the rubber stopper to shrink, thereby fitting tightly with the sensor cable. A hexagonal metal washer is threadedly connected to the outside of the flared mouth. The hexagonal metal washer is used in combination with the flared mouth to tighten the flared mouth.

The invention belongs to the technical field of cables, discloses an anti-freezing buried cable with a phase change sheath, and aims to solve the technical problem that a buried cable in a cold region is easily damaged due to soil frost heaving pressure, the cable comprises an anti-freezing cable and a low-temperature phase change sheath which is coaxially wrapped, and the sheath is formed by embedding six or more groups of arc-shaped splicing strips; the inner side of the splicing strip is provided with a phase change chamber filled with a phase change composite material, the outer side of the splicing strip is provided with an air bag buffer chamber, the end clamping groove is clamped with a heating belt, and the outer side of the sheath is sequentially coated with heat preservation cotton and a glass fiber wrapping belt anti-corrosion layer. The cable flexibility is improved while the anti-pressure capability is guaranteed, laying and installation are facilitated, frost heaving pressure can be effectively relieved, material aging is delayed, the operation safety of the cable is guaranteed, and the service life of the cable is prolonged.

The utility model discloses a kind of roadbed anti-frost heaving structures for filling and digging transition section belong to roadbed anti-frost heaving technical field, the roadbed anti-frost heaving structure includes in vertical direction, from top to bottom sequentially arranged pavement structure layer, first medium coarse sand layer, heat insulation layer and second medium coarse sand layer;The heat insulation performance of heat insulation layer can significantly reduce the influence of external low temperature on roadbed soil, reduce the occurrence of soil frost heaving, ensure the flatness and stability of road.The first medium coarse sand layer and the second medium coarse sand layer have good water permeability, improve the drainage performance of roadbed, can promptly discharge moisture in soil, further reduce the risk of frost heaving.Through preventing roadbed frost heaving, reduce the occurrence of pavement disease, thereby prolong the service life of road, reduce maintenance cost, while the construction process of roadbed anti-frost heaving structure is relatively simple, does not need complex equipment and technology, reduces construction difficulty and cost.

The present application belongs to the technical field of cable, and discloses an anti-freezing buried cable with phase change sheath, which aims to solve the technical problem that the buried cable in cold regions is easily damaged by soil frost heaving pressure. The cable comprises an anti-freezing cable and a coaxial low-temperature phase change sheath. The sheath is composed of six or more arc-shaped splicing strips. The inner side of the splicing strip is provided with a phase change chamber filled with phase change composite material, and the outer side is provided with an air bag buffer chamber. The end part is provided with a heating belt clamped by a clamping groove. The outer side of the sheath is sequentially covered with thermal insulation cotton and a glass fiber wrapping tape corrosion-resistant layer. The present application discards the steel belt armor and relies on the synergistic effect of phase change protection, air bag buffer and active heating to improve the flexibility of the cable while ensuring the compression resistance, facilitating the laying and installation, effectively resolving the frost heaving pressure, delaying material aging, ensuring the safe operation of the cable and prolonging its service life.