After a construction accident, you should first make sure you are in a safe location. After you are safe, you should make sure the site is secure and safe, and there is no likelihood that the construction accident will harm anyone else.
Next, you should alert medical personnel. Sometimes there will be medical professionals on site, or contracted with the construction company. After medical attention has been given, you should alert your superiors, and follow the guidelines in your injury and illness prevention plan.
If you do not know the guidelines in your injury and illness prevention plan, or if your company does not have an injury and illness prevention plan, follow the instructions of your supervisors.