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CN-121976486-A - UHPC prefabricated guardrail for expressway

CN121976486ACN 121976486 ACN121976486 ACN 121976486ACN-121976486-A

Abstract

The invention relates to a UHPC prefabricated guardrail for a highway, which comprises a sheet framework and a UHPC shell, wherein the sheet framework is formed by metal flat wires and carbon fibers, the metal flat wires are woven into a negative Poisson ratio plane unit with a chiral lattice structure, at least three layers of chiral lattice structures are arranged in the rectangular arbitrary side line direction of the negative Poisson ratio plane unit, the carbon fibers are connected in series by taking the negative Poisson ratio plane unit as a section unit to form the sheet framework, and the sheet framework is soaked, coated and solidified by UHPC to form a prefabricated guardrail module. The metal flat wires and the carbon fibers are adopted to form a framework, the UHPC material is poured to form the prefabricated waveform guardrail, the self weight is reduced, the energy absorption capacity and the impact resistance capacity of the guardrail are improved, and the density of micro-straight steel fibers in the magnetic UHPC material and the exposed form of the UHPC cured surface enable the micro-straight steel fibers to have a hydrophobic surface to realize an anti-corrosion effect, so that the service life of the guardrail is prolonged.

Inventors

  • LIAO LIN
  • CAO YU
  • DONG XUMING
  • SHEN LITAO
  • CUI DONGXIA
  • WEI YIQIANG
  • HOU ZEBIAO
  • ZHAO YUNCHUAN
  • GAO GUOQI
  • YUAN RUIDONG

Assignees

  • 山西省交通科技研发有限公司
  • 山西省交通新技术发展有限公司

Dates

Publication Date
20260505
Application Date
20231020

Claims (9)

  1. 1. A UHPC prefabricated guardrail for a highway, comprising a sheet skeleton and a UHPC shell: The sheet framework is formed by metal flat wires and carbon fibers, the metal flat wires are woven into negative poisson ratio plane units with chiral lattice structures, at least three layers of chiral lattice structures are arranged in the direction of any rectangular side line of each negative poisson ratio plane unit, and the carbon fibers are connected in series by taking the negative poisson ratio plane units as cross section units to form the sheet framework; the sheet framework is soaked, coated and solidified by UHPC to form a prefabricated guardrail module; The surface of the UHPC shell is provided with a hydrophobic surface with a density of at least 300 roots/square millimeter, a contact angle of more than 120 degrees and less than 160 degrees, which is formed by exposing micro-straight steel fibers perpendicular to the surface of the UHPC shell.
  2. 2. The UHPC pre-fabricated guardrail for an expressway according to claim 1, characterized in that the chiral lattice structure is any one of a triple-ligament chiral lattice structure, a tetraligament chiral lattice structure or a tetraligament anti-chiral lattice structure.
  3. 3. The UHPC prefabricated guardrail for highways according to claim 1, characterized in that said micro-straight steel fibers have a length of less than 0.1mm, a diameter of less than 15 μm and a doping level of 0.8-6wt%.
  4. 4. A UHPC prefabricated guardrail for highways according to claim 3, characterized in that said UHPC micro-straight steel fibres are incorporated in an amount of 4.65wt%.
  5. 5. The UHPC pre-fabricated guardrail for an expressway according to claim 1, characterized in that the rectangular short side of said negative poisson's ratio planar units determines a sheet skeleton thickness of at least 5mm.
  6. 6. The UHPC pre-cast guardrail for an expressway according to any one of the claims 1-5, characterized in that said pre-cast guardrail modules are provided with pre-cast mounting holes.
  7. 7. The prefabricated UHPC guardrail for highways according to any of claims 1-5, characterized in that the sheet frame is wave-curved and then is wet-coated with UHPC to form a prefabricated wave guardrail module.
  8. 8. The prefabricated UHPC guardrail for highways according to any of claims 1-5, characterized in that the sheet frame is wound into a tube and then is wet-coated with UHPC to form a prefabricated hollow guardrail module.
  9. 9. The UHPC prefabricated guardrail for highways according to claim 8, characterized in that said prefabricated hollow guardrail module is provided with light filling material foamed soil or newtonian bodies inside.

Description

UHPC prefabricated guardrail for expressway Technical Field The invention relates to the technical field of expressway guardrails, in particular to a UHPC prefabricated guardrail for an expressway. Background Newly built expressways are increased year by year, and guardrails are key links and important guarantee for operation safety and driving safety of the expressways. Expressway traffic accidents have become an important factor affecting the road operation benefit, and if the safety performance of the crash barrier is insufficient, the situation that the vehicle falls over the barrier easily occurs. Acceptable guardrails should provide blocking, cushioning and guiding functions for out of control vehicles. However, the prior guardrail mainly comprises a traditional steel or aluminum alloy guardrail, the self weight of the guardrail is large under the traditional structure, the road load is increased, the guardrail is aged after long-term service, the energy absorption is limited under the high-speed rigid collision of the vehicle, the guardrail is easy to fracture and displace, and the guiding function is lost. Disclosure of Invention Aiming at the problems, the invention provides the UHPC prefabricated guardrail for the expressway, which adopts metal flat wires and carbon fibers to form a framework, and UHPC materials are poured to form the prefabricated waveform guardrail, so that the self weight is reduced, the energy absorption capacity and the impact resistance capacity of the guardrail are improved, and the density of micro-straight steel fibers in the UHPC materials and the exposed form of the UHPC cured surface are controlled magnetically to enable the UHPC prefabricated guardrail to have a hydrophobic surface to realize an anti-corrosion effect, and the service life of the guardrail is prolonged. A UHPC pre-fabricated guardrail for a highway comprising a sheet backbone and a UHPC shell: The sheet framework is formed by metal flat wires and carbon fibers, the metal flat wires are woven into negative poisson ratio plane units with chiral lattice structures, at least three layers of chiral lattice structures are arranged in the direction of any rectangular side line of each negative poisson ratio plane unit, and the carbon fibers are connected in series by taking the negative poisson ratio plane units as cross section units to form the sheet framework; And the sheet framework is soaked, coated and solidified by UHPC to form the prefabricated guardrail module. Further, the chiral lattice structure is any one of a triple-ligament chiral lattice structure, a tetraligament chiral lattice structure or a tetraligament inverse chiral lattice structure. Further, the UHPC micro-straight steel fiber has the length of less than 0.1mm, the diameter of less than 15 mu m and the doping amount of 0.8 to 6 weight percent. Further, the surface of the UHPC shell has a hydrophobic surface with micro-straight steel fibers exposed perpendicular to the face of the UHPC shell at a density of at least 300 pieces per square millimeter with a contact angle greater than 120 DEG and less than 160 deg. Further, the mixing amount of the UHPC micro-straight steel fiber is 4.65wt%. Further, the rectangular short edge of the negative poisson's ratio plane unit determines the thickness of the sheet skeleton, and the thickness of the sheet skeleton is at least 5mm. Further, after the sheet framework is bent in a wave mode, the sheet framework is soaked and coated by UHPC to form a prefabricated wave guardrail module. Further, after the sheet framework is rolled into a cylinder shape, the sheet framework is soaked and coated by UHPC to form the prefabricated hollow guardrail module. Further, lightweight filling material foaming soil or Newtonian bodies are arranged in the prefabricated hollow guardrail modules. Further, the prefabricated guardrail module is provided with a reserved mounting hole. The invention has the technical advantages that: 1. The UHPC prefabricated guardrail framework with the negative Poisson's ratio planar units with the chiral lattice structures is designed, a better buffering and blocking function is realized through the impact energy absorption of the negative Poisson's ratio planar units with the chiral lattice structures, and a better guiding function is realized through the serial integrated solidification of carbon fibers, so that the toughness of the guardrail is enhanced, and the fracture possibility of the guardrail is reduced; 2. According to the invention, magnetized micro-straight steel fibers are controlled by magnetic force, so that a hydrophobic surface with a contact angle of more than 120 degrees and less than 160 degrees is formed, natural environment corrosion after installation is avoided, and the service life of the guardrail is effectively prolonged. Drawings Fig. 1 is a schematic diagram of a negative poisson's ratio square planar cell in embodiment one; FIG. 2 is a schematic view of th