Search

CN-121976614-A - Support system based on intelligent alloy locking key activated at low temperature

CN121976614ACN 121976614 ACN121976614 ACN 121976614ACN-121976614-A

Abstract

The invention provides a support system and an installation method based on low-temperature activation of intelligent alloy locking keys, which are used for realizing nondestructive, predictable and controllable high-strength connection effect of force values by introducing an interference fit principle into a macroscopic civil engineering support connection scene, simultaneously adopting high-carbon chromium cobalt molybdenum vanadium special alloy as a locking key core material, providing a solid material foundation for engineering application of a scheme, realizing the controllability and predictability switching of the double working states of 'consolidation-sliding' of a connection node by optimally designing a locking key structure with a preset shearing weak point, and finally successfully realizing the on-line verification of construction quality and the health monitoring of a full life cycle by integrating a temperature-strain sensing system, and realizing the upgrading iteration of a traditional component to an intelligent system.

Inventors

  • DING JIE
  • ZHAO KAIBING
  • HOU LELE

Assignees

  • 中铁十一局集团有限公司
  • 中铁十一局集团第二工程有限公司
  • 中铁十一局集团西安建设有限公司

Dates

Publication Date
20260505
Application Date
20260130

Claims (10)

  1. 1. The intelligent support system based on the low-temperature interference fit principle is characterized by comprising a special alloy intelligent locking key, a support connecting plate with a precise locking key groove and an installation monitoring system integrating sensing and control, wherein the special alloy intelligent locking key is in interference fit with the precise locking key groove at normal temperature.
  2. 2. The intelligent support system according to claim 1, wherein the special alloy intelligent locking key comprises a support connecting disc, a high-strength support bolt, a buffer connector, a support end disc and a sub-end support plug rod, and the integrated sensing and control installation monitoring system is arranged in the special alloy intelligent locking key.
  3. 3. The intelligent support system according to claim 1, wherein the sub-end support plug is provided with a titanium layer.
  4. 4. The intelligent carrier system according to claim 3, wherein said precision splined carrier web comprises a bolt and female end anchor base 8.
  5. 5. The intelligent carrier system of claim 1, wherein the interference fit has an interference of 3-8 μm.
  6. 6. The intelligent pedestal system of claim 5, wherein the integrated sensing and control installation monitoring system comprises a temperature detection component, a stress/strain monitoring component, and a logic control unit.
  7. 7. The intelligent support system according to claim 6, wherein the special alloy intelligent locking key comprises, by weight, 0.8% -1.0% of carbon (C), 4.5% -5.5% of chromium (Cr), 0.9% -1.2% of molybdenum (Mo), 0.9% -1.1% of vanadium (V), 4.0% -5.0% of cobalt (Co), less than or equal to 0.4% of silicon (Si), less than or equal to 0.4% of manganese (Mn), less than or equal to 0.03% of sulfur (S), less than or equal to 0.03% of phosphorus (P), and the balance of iron (Fe).
  8. 8. The intelligent support system according to claim 7, wherein the special alloy intelligent locking key has an elastic modulus (E) of 215+ -5 Gpa, a thermal expansion coefficient of 1.15X10 -5 /°C, a yield strength of 1250MPa or more, and a tensile strength of 1480MPa or more.
  9. 9. The intelligent support system according to claim 1, wherein the special alloy intelligent lock key comprises an annealing process in the processing step.
  10. 10. The intelligent support system according to claim 9, wherein the annealing process comprises the steps of oil quenching, multiple cryogenic treatments and low-temperature tempering in sequence.

Description

Support system based on intelligent alloy locking key activated at low temperature Technical Field The invention belongs to the technical field of earthquake resistance and shock absorption of civil engineering structures, in particular relates to an intelligent sliding support connecting system and method for structures such as buildings and bridges, and particularly relates to an intelligent support system capable of realizing accurate switching of temporary consolidation and later sliding functions. Background In the connection of the structure, the limited sliding is required to be realized in the structure with shock resistance or larger stress, namely, under the condition of ensuring normal transmission of vertical force and bending moment, the horizontal force can be released to a certain extent when encountering destructive earthquake force or other axial force, the structure is ensured to be separated but not completely separated, the connectivity of the structure is effectively ensured, and the high-reliability operation is realized. Sliding supports (such as friction pendulum supports and plate-type rubber supports) are core elements of modern structures for resisting earthquakes and releasing temperature stress. The traditional connection mode of the embedded part and the upper and lower structures has inherent defects that 1) the embedded part is connected through bolts, stress concentration is caused by drilling, fatigue damage is easy to occur, the installation accuracy requirement is high, and the construction efficiency is low. 2) The welding connection is that residual stress is generated in the field hot work, the material performance is changed, and the welding connection is permanently and rigidly connected, so that the welding connection cannot meet different requirements of construction and use stages. 3) The adhesive connection has the problems of ageing and creep, and has poor long-term reliability and limited bearing capacity. At present, the prior art lacks an intelligent connection scheme which can be installed in a lossless manner, provide a calculable and reliable temporary consolidation force and automatically switch to a sliding state according to preset conditions, and the contradiction is particularly prominent in large-scale structure pushing construction, bridge closure and recoverable functional structures. Disclosure of Invention Based on the defects in the prior art, the invention provides an intelligent support system based on a low-temperature interference fit principle. The alloy locking key with special design is cooled for installation, the temporary consolidation is realized by utilizing huge and controllable pretightening force generated by the re-heating expansion of the alloy locking key, and when the structure needs to slide, the consolidation is intelligently released by preset mechanical conditions, so that the normal function of the support is realized. The invention relates to an intelligent support system based on a low-temperature interference fit principle, which comprises a special alloy intelligent locking key, a support connecting plate with a precise locking key groove and an installation monitoring system integrating sensing and control, wherein the special alloy intelligent locking key is in interference fit with the precise locking key groove at normal temperature. Further, the special alloy intelligent locking key comprises a support connecting disc, a high-strength support bolt, a buffer connector, a support end disc and a sub-end support plug rod, and the installation monitoring system integrating sensing and control is arranged in the special alloy intelligent locking key. Further, a titanium layer is arranged on the sub-end support plug rod. Further, the support connection plate with the precise lock key groove comprises a bolt and a female end anchoring base 8. Further, the interference fit has an interference of 3-8 μm. Further, the integrated sensing and control installation monitoring system includes a temperature detection component, a stress/strain monitoring component, and a logic control unit. Further, the intelligent locking key of the special alloy comprises, by weight, 0.8% -1.0% of carbon (C), 4.5% -5.5% of chromium (Cr), 0.9% -1.2% of molybdenum (Mo), 0.9% -1.1% of vanadium (V), 4.0% -5.0% of cobalt (Co), less than or equal to 0.4% of silicon (Si), less than or equal to 0.4% of manganese (Mn), less than or equal to 0.03% of sulfur (S), less than or equal to 0.03% of phosphorus (P), and the balance of iron (Fe). Further, the elastic modulus (E) of the special alloy intelligent locking key is 215+/-5 Gpa, the thermal expansion coefficient is 1.15X10 -5/°C, the yield strength is more than or equal to 1250Mpa, and the tensile strength is more than or equal to 1480Mpa. Further, the special alloy intelligent locking key comprises an annealing treatment process in the processing step. Further, the annealing treatment process comprises