The specific construction process is described as follows:
Safety Facilities Preparation at Construction Site
1. Determine the way of road closure according to the width of the road, the size of traffic flow and the size of construction.
2. It is necessary to configure special personnel to be engaged in safety work, and set up "traffic engineering construction" and other eye-catching signs and traffic cones, safety grille and other facilities
3. Traffic safety officers should wear armbands, command flags and siren, communication radio and other equipment.
4. All construction personnel should wear uniforms with obvious signs and striking colors.
5. Reflective clothing should be used for night construction to ensure the safety of construction personnel and the project.
Road Surface Cleaning
Cleaning road surface is not only the foundation of road marking construction, but also the primary condition to ensure adhesion effect of coating film. This is not only the dust on the road surface to be removed by special equipment, but also to pay attention to whether there is water, or whether the road surface is wet, when necessary, should apply gas flame heating and drying road surface before construction. If old lines exist, they should be removed if necessary to ensure the adhesion effect and the smoothness and reflective effect of the marked lines.
Heating Thermoplastic Road Marking Paint
The process of paint heating is very important and will directly affect the quality of marking film. Generally should be based on the requirements of paint manufacturers, usually began to melt paint, to use a small fire heating and put in a small amount of paint, until it began to melt when the agitator applied stirring, and constantly put new material into the kettle, increase the amount of fire and strengthen mixing, until the kettle coating all melt, the temperature reached 180℃~200℃, Coating insulation mixing for 3-5 minutes or so, it can be put into the construction equipment, marking the construction. It's worth noting the following：
1.The application temperature of paint depends on the specific environment and the nature of the paint itself. Generally speaking, if the construction environment temperature is lower, the temperature of paint set a point higher; When you see the surface of glass bead deposition is serious, the coating temperature can be a bit lower. The effect of line will be much better in that way. Usually heating temperature is between 180 and 200 degrees. The optimum ambient temperature is about 25°
2.The same construction project, the same paint, melting viscosity of paint should be as consistent as possible, so as to facilitate the mastery of construction conditions.
3.To avoid heating for a long time at a higher temperature, in order to prevent the occurrence of paint discoloration and resin cracking, additives over volatilization, and eventually lead to the reduction of coating quality.
4.After the release of the melted paint, the new paint has not been added to the kettle, It will be better to reduce the amount of fire.
5.In the heating process, in order to improve efficiency and ensure that melted paint does not overheat, it is necessary to constantly adjust the amount of flame and mixing speed according to the specific situation.
6.The quantity of used materials should be planned every day. At the end of the construction, there should not be too much paint left in the kettle or clean up, repeated heating should be avoided.
The Application of Pre-marking and Spraying Primer
1.Generally, pre-marking should be carried out according to the requirements of national standards or the party of proprietor. Prepare tape measure, powder bag, liquid coating, pre-marking machine and other tools. If use powder material as pre-marking,titanium dioxide or lithopone pigment will be better, their durability is stronger. Pre-marking can ensure the accuracy and standard of actual marking construction and avoid bad influence caused by wrong marking.
The primer can effectively increase the adhesion between the marking line coating film and the road surface, and has a better effect on preventing (especially on old road surface or concrete road) marking line falling off. In actual construction, different kinds of pavement materials usually use.
Thermoplastic Road Line Construction
Marking construction is the most critical step in the whole construction process, should grasp the following operation links:
1．Construction machinery should be inspected before construction to ensure that the equipment is in good condition. When necessary, the test section should be applied on the spot to detect coating construction temperature, coating thickness, retroreflection coefficient and glass bead quantity and other control and quality indicators, and the parameters should be adjusted when necessary.
2．Before the application of melted paint, must ensure primer dry, otherwise it will cause the coating to produce bubbles due to the volatilization of solvents. On the other hand, it is easy to cause the burning of the undried primer, resulting in serious adverse consequences.
3．In the process of construction, the melted paint in the machine should be often stirred to prevent settlement stratification.
4. The use of drop-on type glass beads plays a decisive role in marking reflective effect. Experience shows that the reflection effect is ideal when the glass bead radius is embedded and the radius (the glass bead falls one half or two thirds into the marking line) is exposed.
5．The operator should avoid construction at lower temperature as far as possible, the road surface should be heated under special circumstances, and then carry out construction marking.
6．For the new paved asphalt pavement, the road marking construction is generally carried out two weeks after opening to traffic. For cement pavement, road marking is usually carried out 6 to 8 weeks after opening to traffic.
Repaired and Opened to Traffic
After the construction of hot melt marking line, it is necessary to repair the unqualified marking line and clean the site properly after construction. For example, the dropped glass beads should be cleaned up to prevent pedestrians from slipping or vehicles from slipping. Once the site is cleaned and the line is dry and hardened, it can be opened to traffic.
