【正文】 llround way. The anticollision guardrail includes the concrete functions of four respects: 1)Prevent vehicle from jump outlet (bridge ) outside, is it bring to separate to central authorities but speech, is it prevent vehicle from pass through central authorities is it take but intrude upon correctly the lane to separate to want。 Wave form guardrail have heavy suitability, suitable for all highway section basically, especially small radius curved dish is it lead highway section of sight to need. Require according to norm and Hunan Province many pieces of highspeed highway safety guardrail design experience, the general way side of highway section adopts the roof beam guardrail of the wave form , the specific very difficult dangerous highway section adopts the concrete guardrail . In a situation that the volume of traffic is big, vehicle go at a high speed, is it cross central authorities separate the situation led to happen, may produce the serious consequence , so, the central authorities separate the width that bring as the important basis of setting up guardrail . Anticollision cushion through absorb vehicle collide energy make vehicle39。s needs as well as the cost is the lowest, and elegant in appearance, and can lead the sight of driving a vehicle . The cable guardrail is suitable for not having evenly no sinking , snow , long straight line , highway section with the special beautiful demand 。t set up place of the guardrail set up the guardrail , bee the new barrier instead, it is dangerous to increase the accident. So, should grasp the characteristic of the guardrail to the design of the safe guardrail first and bine the traffic condition of the expressway, on the premise of meeting basic function of the guardrail , select the sui table guardrail form for use, adopt the rational establishment principle. Because topographical terms , make the investment and technological terms to restrain from many kinds of factor, way side have barrier unavoidably, to exceed vehicle of outlet form the potential danger. Way side guardrail set up in be able to reduce accident serious place of degree only, its design principle is confirmed according to people39。ROADGUARD BARRIER SYSTEM The roadguard barrier, 6 feet long, feet high, 2 feet wide at base, with its patented design, is the only barrier of its type that self locks without the need for additional assistance. No barrier, other than the roadguard barrier, can selflock without the need of additional apparatus, such as a cable, strap, rod or coupler. In addition, the roadguard barrier, because of its unique patented design allows for curved configurations of up to 15 degrees at each barrier connection, in either direction, while remaining locked to the adjacent barrier. No other barrier can make that claim! Also, the roadguard barrier is designed for the addition of signs screens and flashers because of the built in slots for such devises and is easier to maneuver because of its weight and two carrying slots contained in each barrier. The patented interior design of the roadguard barrier prevents bulging and keeps its side’s straight and trim while maintaining a weight of only 125 lbs. Empty but a secure 1675 lbs. The roadguard corner connector barrier is designed for use with the roadguard barrier as a connecting barrier unit to allow for either left or right angle turns, or both simultaneously, of between 75 to 105 degrees while locking together all connecting barriers. In addition, the corner connector barrier allows for the initial roadguard barrier line to continue after connecting barrier line extensions to the left and/or the right. Lightweight and easy to handle, the roadguard corner connector barrier is 2 feet in length and width and feet in height, designed to correspond with the roadguard barrier. Directly beneath the filling hole of the roadguard corner connector barrier is a pin extending upward internally from the bottom of the barrier to secure firmly a pole or pipe that can be inserted downward through the filling hole. Said pole or pipe can be used to attach signage, privacy screens or security panels that extend above the barrier line height. The roadguard highway assembly is a reinforcement system for highway barriers that distribute and transfer forces that may occur upon impact of a vehicle so that the overall highway barrier system will have greater strength and integrity. The roadguard highway assembly system meets all NCHRP 350, Test Level 3 Truck and Car Crash Test Specifications, and is approved by the FHWA for use on highway construction projects where the posted vehicle speed in a work zone can be as high as 62mph/100kph. The roadguard highway assembly is a fabricated steel assembly designed to easily mount to the roadguard barriers. This ASSEMBLY provides two distinct functions: Providing a strong and resilient outer surface to resist the wheel and bumper of a striking vehicle, and to link the barriers more securely to each other and create a very robust linear system such that the force of a striking vehicle will be distributed over many barriers, minimizing the lateral movement at the point of impact. The roadguard security panel is used for perimeter security, safety, crowd control and general site protection. These 6’ x 4’ chain link fence panel units install firmly on a roadguard barrier to give a stable 8 foot high continuous, unbroken protective fence for all security and safety needs. Optional solid material, screen, or interwoven chain link panels are available. Our study area lies in the north of modern delta of the Huanghe River and it was formed by the river way of Diaokou in Huanghe River has the largest content of silt and may transport about The subdelta was built quickly under the supply of abundant sedimen