Traffic safety facilities have become a part of the regional vision system, which is helpful for drivers and passengers to foresee the changes in the direction and road conditions in expressway, improve driving comfort and effectively reduce accidents and losses caused by accidents. The implementation of professional engineering management system is the guarantee for the construction and smooth operation of traffic safety facilities, and also the realization of speed and efficiency! An important way to combine quantity and quality organically; Hire professional engineers with high technical level and rich engineering experience, formulate strict management system, assign personnel to set posts and responsibilities according to the characteristics of the project and closely follow the key and difficult points of the project, supervise the project quality and ensure the project progress.
1, traffic safety facilities engineering construction quality control management means
Quality is the soul and life of highway engineering, it is a century-long plan, a great event for the benefit of future generations, and it is also the reputation and life of enterprises. Traffic safety engineering facilities have unique construction characteristics different from civil engineering, and also have control means and key points different from civil engineering in quality control. According to reality, quality control can be carried out from the following aspects.
(1) quality control of raw materials
Strengthening the quality inspection of products and raw materials before construction is the most critical quality management procedure, and refusing any products or raw materials that do not meet the requirements of design or technical specifications to enter the construction site. The quality of materials entering the site controls the quality of traffic safety facilities. For example, the hidden danger of signs, corrugated beam guardrail, isolation guardrail and so on. It often does not appear in the installation process, but in the quality of materials entering the site. Installation inspection is easier to control, and defects are easier to find and correct. However, the quality problems of incoming materials are often difficult to find in time, and usually can be gradually exposed during use. Therefore, it is very important to check the quality of incoming materials.
Relevant personnel must check and confirm the production equipment capacity, process level and the effectiveness of its quality assurance system at the purchasing manufacturer, and conduct irregular inspections during the supply process to ensure that the products provided by the manufacturer are qualified. After the products enter the market, technicians must test and inspect according to regulations before they can be used for installation. If in doubt, the corresponding inspection items and frequency can be increased.
There are two main means: checking the product quality certificate and spot laboratory sampling inspection. This procedure should be strictly implemented in each batch. When necessary, the raw materials and processing technology should be checked at the product processing manufacturer. For example, after the finished corrugated beam enters the construction site, check whether there is a production certificate and various technical indicators, and conduct random inspection, including appearance size inspection, thickness inspection, rust prevention treatment inspection, and mechanical performance inspection of basic steel. , focus on sampling the thickness of corrugated beam steel plate, galvanized thickness and uniformity, because the thickness of corrugated beam steel plate is different by 0. 1mm, its anti-collision performance is greatly reduced; The thickness and uniformity of galvanized layer directly affect the service life of corrugated beam.
If a serious situation is found, the manufacturer's handling procedures must be checked immediately; Check whether the bottom plate material meets the relevant regulations, and then test its chromaticity performance, photometric performance, retroreflection coefficient, luminous intensity coefficient, weather resistance, bending resistance and anti-corrosion treatment. For the sign line, mainly check the reflective performance and adhesion of the sign material, and for the isolation guardrail, mainly check the appearance size and anti-corrosion treatment.
(2) Strengthen the control of technological process,
Ensure the quality and eliminate the occurrence of unqualified processes hidden in the project. For example, the construction process of corrugated beam steel guardrail is: lofting-piling-guardrail installation-guardrail alignment and adjustment; The construction process of anti-glare board is: lofting-bracket and anti-glare board installation-anti-glare board alignment and adjustment. The construction procedures of isolation fence and anti-throwing net are: lofting-digging-pouring foundation, column installation-hanging net; The construction process of the sign is: foundation positioning and lofting-foundation pit excavation-foundation concrete pouring-sign column installation-sign plate installation; The marking construction process is: lofting-pavement cleaning-priming-marking.
(3) Control of professionals
Professionals use a wide range of professional knowledge and rich work experience, which is an important basis for strengthening the quality of the project. With the rapid development of expressway today, professionals engaged in traffic engineering are very nervous. The qualifications and abilities of professionals entering the site must be carefully examined. If necessary, relevant personnel can be transferred for short-term training, and those who fail are not allowed to take up their posts. Educate the engineers and technicians in the project department to realize that the most important thing to create high-quality projects is to meet the quality objectives required by the contract, conscientiously perform the supervision procedures, start with the most basic construction elements, and strictly control the quality.
(4) Establish a reasonable quality management system.
Construction projects are supported by a good management system and run according to the mechanism. As the manager of the construction project, the project chief engineer is the person in charge of the whole project quality and formulates the general principles and policies of the project quality. Quality inspection engineers and operators regularly check the quality of the projects under construction. If they find that they do not meet the requirements of the specifications, the construction team is required to rectify immediately until they meet the requirements of the specifications before entering the next process. Project professional technicians or professional engineers provide on-site technical guidance and supervision, and solve the problems on site in time. In this way, a horizontal management system from self-construction to various professions has been formed, thus ensuring the engineering quality well.
2, traffic safety facilities engineering construction quality control measures.
The key link of quality control of traffic safety facilities engineering construction lies in the construction process of engineering construction. For general traffic safety facilities, there are specific control factors such as crash barriers, crash barriers, signs, markings, and the safety of the surrounding environment. Therefore, taking scientific and effective measures against these specific factors is an inevitable guarantee to ensure the completion of traffic safety facilities. Specific measures are as follows.
2. 1 crash barrier
Corrugated beam guardrail is widely used in expressway, China. It absorbs energy by using the deformation of soil foundation, columns and beams, forcing out-of-control vehicles to change direction and resume normal driving, preventing vehicles from rushing off the road or crossing the median, protecting vehicles and passengers, and reducing the losses caused by accidents.
2.2 anti-collision guardrail
On the high-grade highway, in order to prevent people and animals irrelevant to the highway from entering, ensure the safety of high-speed vehicles and prevent illegal occupation of land, the most common problem of isolation guardrail is that it is stolen from time to time because of poor strength, which not only causes economic losses to managers, but also adversely affects safe driving. Therefore, the quality of field installation must be strengthened.
Construction lofting should be carried out in strict accordance with the design drawings. Firstly, the center line is determined from the ditches on both sides of the road to ensure the accuracy of the highway land use range, and then the position of the column is determined on the center line, and marks are made at each pile position; On the basis of setting out and positioning, start digging holes according to the requirements of design drawings. The plane size and depth should not be less than the design requirements, and the pit bottom should be cleaned. Connect the mesh, first connect the mesh with the ground column (connecting bolts cannot be tightened), erect it according to the position of each foundation pit after connection, and support it with temporary support, and adjust it according to the design drawings and site topography to ensure smooth and beautiful line shape; After the fence is found to be qualified by the supervisor, concrete can be poured into the pit. When the concrete strength reaches more than 80% of the design mark, the temporary support can be removed and the bolts can be tightened.
2.3 Signs and markings
Traffic signs play an important role in the whole traffic safety facilities, just like a silent radio station, which provides clear, timely and sufficient information for road users 24 hours a day to guide and organize traffic flow. Traffic signs are directly related to traffic operation and road users' knowledge and understanding of roads [4].
First of all, the layout of the sign foundation should be carried out in strict accordance with the requirements of design drawings to ensure that the mileage position and clear height of the sign meet the design requirements; The geometric size and buried depth of the sign foundation must meet the design requirements to ensure the stability of the sign foundation. Only when the concrete strength reaches more than 80% of the design strength can the sign be installed.
At the same time, in order to ensure the flatness of the sign board, the supervisor must strictly control the steel bars on the back of the sign to enhance the integrity of the sign structure; In the process of sign installation, it is necessary to accurately control the parallelism and verticality of the reference plane of sign installation, so as to provide the necessary technical guarantee for the qualification of the sign after installation.
For marking, traffic marking plays the role of channelization, separation and diversion of traffic flow, and also beautifies the road. Therefore, the marking project must ensure that the line shape is smooth and consistent with the road line shape, and ensure good day and night line-of-sight induction. At the same time, it is necessary to ensure that the geometric size of the marking line is standardized and has sufficient adhesion to the road surface.
3. Conclusion and prospect
Traffic marking is an indispensable part of traffic safety facilities. Traffic safety facilities, service facilities, management facilities and civil engineering are a comprehensive organic system, which must be considered comprehensively and designed simultaneously. On the one hand, mutual interference and contradiction can be avoided, on the other hand, various majors can carry out design work under the guidance of overall design.
In the successful work of traffic safety facilities, a highway traffic safety facilities project should not be undertaken by a construction unit, but a competition mechanism should be introduced in the whole process to improve the contractor's competitiveness, sense of crisis and sense of responsibility, and effectively ensure the quality and progress of the project. At the same time, according to the function, the content of traffic safety facilities should be refined, and the road of industry systematization and professional theorization should be gradually taken to establish industry franchise companies;
In addition, perfect and reasonable traffic safety facilities can beautify the environment, coordinate the landscape, activate the vision, and provide comfortable, safe and fast services for drivers and passengers. Therefore, in the process of construction, we must vigorously strengthen the publicity and control of environmental safety, prevent pollution and damage to the completed pavement, and prohibit littering, otherwise it will lead to the regret of traffic safety facilities and become a fly in the ointment.
In short, the development of traffic safety facilities in China is not yet mature, so it is necessary to strengthen academic exchanges at home and abroad and learn from each other's good technical measures and experiences.
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd