Compound braking unit body for stopping at pavement at tail end of airfield runway

Abstract

The invention discloses a compound braking unit body for stopping at a pavement at the tail end of an airfield runway, and provides the compound braking unit body which is good in water resistance, flame retardance and crumple energy absorption and long in service life. The scheme is that a composite protective top cover comprises double layers or multiple layers of hot mold forming materials of which the strength is gradually decreased and the brittleness is gradually increased from outside to inside; the outer layer of the top cover is made from a sheet molding compound (SMC) composite of which the fiber cross angle is 45 degrees to 82 degrees and the glass fiber amount is 50% or above; the inner layer of the top cover is made from bulk molding compound (BMC) which is strengthened through brittle glass fibers of which the glass fiber content is 5% to 10%, is chemically thickened through unsaturated polyester, has the glass fiber content of 9% to 25%, and is manufactured through mold pressing; and a crumple energy absorption zone between the composite protective top cover (2) and a plastic waterproof bottom tray is filled with foam concrete with good crumple energy absorption and / or a foam crumple energy absorption cube made from a glass foam material.

Description

Technical field [0001] The present invention mainly relates to a composite characteristic foam material arresting unit body used for airport runway end arresting or highway dangerous section arresting and braking systems, especially for airfields and the composite brake unit body. bed. Background technique [0002] In order to ensure the safe landing of aircraft, more and more attention is paid to the issue of aircraft landing control. After the aircraft completes the landing under the guidance of the automatic landing system, or when there is an emergency or an emergency landing is required, due to the conditions, it is necessary to decelerate and brake under a limited runway length, and an aircraft blocker is required. In the past four decades, due to the increase in the landing speed and weight of aircraft, the airfields of the Air Force, especially those used by frontline support aircraft, have been repaired quite long, usually around 2,000 meters. However, many aircraft sti...

AI Technical Summary

Problems solved by technology

The advantages are: low density, light weight, heat preservation, sound insulation, and earthquake resistance, but there are still defects such as low strength, cracking, and water absorption. Among them, the strength is low: the volume density is 800-859kg / m³; The compressive strength is seriously low, generally less than 2.5MPa, and some are even less than 1.0MPa, and the open porosity is high: due to the destructive effect of Na, K, etc. on the bubbles in the foam concrete, the pores in it are mostly open Pores, Cracks, Water Absorption: The surface of the hardened foam concrete cracks, resulting in the absorption of large amounts of external moisture

However, the environmental weather resistance of these materials has defects, and there are no requirements for the safety of the materials such as flame retardancy, and the safety and life of the system cannot be guaranteed.

The main problems at present are: poor mobility, long installation period and high cost; multi-type interception cannot be realized; the arresting distance cannot be adjusted; in addition, the active arresting equipment system cannot be self-independent, and it takes a long time to restore use after arresting, which cannot be realized Two-way blocking, performance and price ratio is not optimal

Anti-ultraviolet radiation erosion, waterproof and its water resistance, flame retardancy, and ice liquid corrosion resistance are difficult to meet the requirements

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