Introduction: the cable guardrail is a flexible structure, the cable works in the elastic range when the vehicle collides, it can be reused and easy to repair. Comparison of column spacing < br / >
It is flexible and less affected by uneven subsidence. It is more beautiful to use cable guardrail in scenic area highway. In snow covered area, the obstacle of cable guardrail to snow sweeping is less.
However, the construction of cable guardrail is complex, and it is difficult to repair the damaged end column, so it is not suitable for use in small radius curve section
It is uneconomical to set the length short time.
(2) Middle end column. When the installation length of cable guardrail exceeds 200-300m, the middle end structure shall be adopted. The middle end knot of roadside cable guardrail < br / >
It is a triangle. The end column is composed of triangle support, bottom plate and concrete foundation. The structure and size of the end column are analyzed.
Classification: < br / >
The cable guardrail is divided into plastic dipping type B (common type), plastic dipping type A (reinforced type), hot galvanizing type B (common type) and hot galvanizing type A (reinforced type). Grade a < br / >
The initial tension of Grade A and B cables is 201d ~, and 3x7 cables with high strength and excellent corrosion resistance are used
Galvanized / right screwed construction. Characteristics: compared with the traditional guardrail, it has good flexibility resistance, strong impact resistance, good anti-collision performance, high snow load resistance and wind load resistance
Point. In addition, the cable guardrail with better permeability has a wide field of vision, which will be more conducive for tourists to enjoy the natural landscape.
Installation: < br / >
The end structure is installed at the beginning and end of the cable guardrail. In order to maintain the initial tension of the cable and simplify the installation and construction of the tensioning equipment, maintain a < br / >
For the convenience of maintenance, the cable installation length is generally set as 200-300m, that is to say, every < br / >
The length of each cable shall not exceed 300m. The end structure can be embedded or assembled. The embedded end structure is integrated with the concrete foundation
The embedded depth of the end column varies from 400 to 500 NMA according to different types. The inclined column of the triangular support forms a 45 DEG; angle with the ground, and a piece is welded at the bottom
Steel plate, on the one hand, can make the triangular support form a stable frame, on the other hand, through the steel plate at the bottom, it can greatly increase the adhesion with the foundation concrete < br / >
It is easy to control the position of elevation through steel plate. The prefabricated end structure is connected with the concrete foundation through the embedded parts, and the end structure is embedded < br / >
The components vary with different structures and categories. The A-class triangular support is made of 6 pieces of 8 pieces of 600nm long, embedded anchor bolts, 6 anchor bolts and steel plate < br / >
On the one hand, it can locate the position of anchor bolts, on the other hand, it can greatly strengthen the bond strength with concrete.
Structure: < br / >
End column. The end column of roadside cable guardrail is the main structure to bear the cable tension and the collision force of out of control vehicles
It is composed of floor and concrete foundation.
Principle: Cable guardrail is the main representative form of flexible guardrail, which is a structure composed of several cables with initial tension fixed on the column
It mainly relies on the tensile stress of the cable to resist vehicle collision and absorb collision energy. The cable guardrail is a flexible structure, and the cable is in the elastic range < br / > when the vehicle collides
It can be reused and easy to repair. The space between columns is flexible and less affected by uneven settlement. The highway in the scenic area is protected by cables < br / >
It is more beautiful. In snow covered area, the obstacle of cable guardrail to snow sweeping is less. However, the construction of cable guardrail is complex, and it is difficult to repair the damaged end column, so it is not suitable for < br / >
Use in small radius curve section
