Folding construction process
Construction conditions → accurate lofting → roughening of contact surface and adjustment of embedded steel bars → fabrication and installation of steel bars → formwork installation → concrete pouring → formwork removal → maintenance.
Folding quality control
1, the template should be cleaned before each installation, and the release agent should be coated evenly.
2, guardrail steel welding and binding should comply with the design and specification requirements, especially the internal reinforcement position should be accurate.
3, template after installation to check the template side and top surface, template side and top surface should be straight.
4. The honeycomb pits on the concrete surface of the guardrail shall not exceed 0.5% of the surface area and the depth shall not exceed 10 mm. ..
5. One-sided guardrail within the same span shall be poured at one time, and the end formwork shall be steel formwork to ensure the appearance of the end.
6, guardrail surface and joint can not have cracking phenomenon. Dislocation, flatness and appearance quality problems should be handled in time, and the colors should be consistent. The top surface is smooth and beautiful, and the height is consistent.
7. The linear straight line segment of guardrail bridge is straight, and the curved line segment is round, with no broken line and dead angle.
Folding classification
Guardrails are widely used in the maintenance of municipal engineering, transportation, residential areas, ports, airports and storage areas. These products are becoming more and more mature and become an important branch of the building materials industry, with the scale of the industry expanding and more and more styles.
Guardrails are classified by materials, including iron guardrails, stone guardrails, PVC guardrails, wooden guardrails, cement guardrails, plastic steel guardrails, stainless steel guardrails and glass guardrails. According to the function and use of guardrails, there are balcony guardrails, stair guardrails, air-conditioning guardrails, residential guardrails, villa guardrails, burglar-proof guardrails and stadium guardrails. According to the decorative features of guardrails, there are artistic guardrails, wrought iron guardrails, panoramic guardrails, bay window guardrails, grating guardrails, American guardrails and European guardrails.
Classification by appearance: double-sided wire fence, frame fence, double-ring fence, Meg fence, crocheted fence and steel fence.
(1) Road sections with slopes and embankments of Grade II and above within the specified range;
② Road sections with rivers, lakes, seas, swamps, waterways and other waters.
(1) Road sections with slopes and embankments of Grade II and above within the specified range;
(2) In the roadside safety clearance area of expressways and first-class highways, there are lighting lamps, cameras, variable information signs, traffic signs, cutting support walls, sound barriers, piers or abutments and other facilities, and the roads where vehicles cannot pass safely;
(3) Roadside ditch excavation section where there is no cover plate on the second-class and above highways and vehicles cannot pass safely;
④ There are cliffs, deep valleys, deep ditches and other sections along the third and fourth grade highways.
Safety theory of road guardrail: the running vehicles have great maneuverability. When there is a dangerous situation, the vehicle will go out of control and rush to the guardrail. At this time, the function of road guardrail is to avoid violent collision of vehicles and casualties.
In such a matter, people all hope to strengthen the safety of road driving. Road guardrail is an emergency and dangerous situation, when vehicles run out of control and rush out of the road, which will inevitably lead to accidents. The protective measures of road guardrail are very important. Although road guardrail can not reduce the avoidance or occurrence of traffic accidents, it can greatly reduce the casualties caused by accidents.
Characteristics and requirements of impact modifier for road guardrail
At present, there are two kinds of impact modifiers commonly used in highway guardrail profile enterprises: CPE and ACR. CPE is relatively cheap, and acrylic ACR impact modifier is relatively expensive, but the quality of domestic products is not as stable as that of imported products, so imported products should be chosen. Foreign products such as PA4006, KM355P, PM2 1. The filler of zinc-steel guardrail facing can be stearic acid, and the amount of coupling agent treatment directly affects the whiteness, gloss, dimensional change rate, hardness and other indexes of the profile. Pigmentation should pay attention to high heat resistance index, and it is best to make wood masterbatch to make it evenly dispersed. Highway guardrail enterprises should pay attention to the balance of internal and external lubrication when choosing lubrication system. Neither lubricant nor internal lubricant can be used excessively, otherwise the performance of the product will be reduced. The selection of lubrication system can only be used in production after practical verification. In addition, zinc-steel guardrail enterprises believe that the selection of lubrication system should be compatible with the use of stabilizer, and the amount of external lubricant in general organotin formula should be appropriately increased.
Road guardrail refers to the road guardrail made of zinc alloy material. Because of its high strength, high hardness, beautiful appearance and bright color, it has become the mainstream product used by municipal administration and transportation bureau. Zinc-steel guardrail has been developed for many years. The development history of guardrail is from the most traditional guardrail (brick, bamboo, wood number), wrought iron guardrail, stainless steel guardrail, aluminum alloy guardrail, PVC guardrail, and finally the appearance of zinc-steel guardrail. Zinc-steel guardrail perfectly solves the shortcomings of traditional guardrail, and its price is moderate, so it has become a substitute for traditional guardrail materials. Now let's learn more about the advantages of zinc-steel guardrail!
1, long service life, high hardness, high durability and high temperature resistance: steel balcony guardrail fittings are made of modified high-strength engineering nylon, and the service life is as long as 50 years. Its strength and hardness are much higher than that of ordinary steel, and it can bear the pressure above 183MPA and the tensile force of 2729MPA per square meter, and can withstand the high temperature below 220℃ without deformation.
2. The base material of zinc-steel guardrail is Q235 and Q 195 steel, which is firm and practical.
3, high corrosion resistance, no rust: soak the zinc-steel guardrail substrate in a hot-dip zinc bath, adsorb a layer of zinc on the surface, and then achieve the electrochemical maintenance effect to prevent the steel substrate from rusting from the inside out. After pretreatment and zinc-rich phosphating treatment, the adhesion between the coating and the substrate is enhanced. A permanent coating is formed after the colored powder is coated with polyester. No matter what the environment, the zinc-steel guardrail will not rust, fade, fall off powder and fall off, and the color is durable.
4. The zinc-steel guardrail adopts assembled design, which is convenient and simple to install.
5. The zinc-steel guardrail is sprayed with imported Akzo Nobel powder, with outstanding decoration and rich color matching to meet the individual needs of different customers.
6. The zinc-steel guardrail is environmentally friendly and does not pollute the environment, which solves the problem that general goods pollute buildings.
7. The zinc-steel guardrail adopts high-end enamel-like electrophoresis technology and electrostatic spraying technology, so that the guardrail product has excellent self-cleaning function, and it is still as bright as new after being washed by rain and sprayed by water gun.
.8. The zinc-steel guardrail adopts safety screws made of stainless steel to prevent theft, which solves your worries.
9. The zinc-steel guardrail has excellent weatherability: by using the characteristics of its aluminum alloy, the surface has been specially treated, and it can be used safely in cities with air pollution or coastal areas corroded by sea salt to solve your maintenance worries.
10, the streamlined appearance and soft colors of the zinc-steel guardrail can be harmoniously integrated into modern urban space and natural environment, so that you don't feel abrupt.
I believe that after the above introduction, everyone has a certain understanding of the construction technology, folding classification and safety theory of road guardrail. Welcome to Zhong Da for more information.
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