(in order to understand the construction vividly, the video shall be shown first) 1.2.2.1 supervision work before commencement (1) Be familiar with and understand the contents of drawings.
acid pickling inspection; D.
It absorbs collision energy by using the deformation of soil foundation, column and beam, and forces the out of control vehicle to change direction.
The forms of guardrail can be divided into flexible guardrail, semi-rigid guardrail and rigid guardrail according to different stiffness.
Semi rigid guardrail is a continuous beam column guardrail structure with certain rigidity and flexibility.
That is, the whole process supervision must be implemented from the production and procurement of traffic engineering facilities to the completion acceptance; There must be scientific detection means to speak with data to ensure the high quality of construction.
Flexible guardrail is a tough guardrail structure with large buffer capacity.
The median guardrail is set in the highway median to prevent vehicles from crossing the median into the opposite lane and protect the structures in the median.
Roadside guardrails are set on highway shoulders to prevent runaway vehicles from crossing the road and avoiding collision with roadsides Other facilities.
The construction of facilities in traffic engineering is mainly installation, which is not completely the same as civil engineering.
At the same time, the collision vehicle also returns to the normal driving direction.
It completely depends on the tensile stress of the cable to resist the collision of vehicles and absorb collision energy.
The energy in the collision process mainly depends on the contact between the vehicle and the guardrail and climbing or turning along the guardrail surface.
Open bidding shall be conducted for bulk equipment suppliers.
Cable guardrail is the main representative form of flexible guardrail.
It is necessary to formulate supervision procedures suitable for the construction and installation of traffic facilities.
It is a beam structure fixed with pillars, which relies on the bending deformation and tensioning force of guardrail to resist vehicle collision.
Therefore, the section shape and geometric size of the concrete guardrail directly affect the impact effect.
The competent department of the Ministry of communications has formulated the test items and standards of traffic safety facilities engineering, and the supervisor can prepare them according to relevant specifications.
Especially, for example, the electronic circuits in the three systems are complex, we should understand and read carefully, and understand the functions and requirements of each part, so as to master them well during supervision.
inspection of materials (steel and plastic coated materials); B.
it is also necessary to evaluate suppliers while making quality evaluation Comprehensively evaluate the quotation and other factors, and select suppliers with good reputation and quality assurance.
The construction and supervision workflow of corrugated beam guardrail is shown in Figure 13-1.
Guardrails used on roads can be divided into anti-collision guardrails and Bridge guardrails in general sections according to sections, and roadside guardrails and median guardrails according to setting positions.
Therefore, it is particularly important for manufacturers to improve and operate a good quality assurance system..
(1) Flexible guardrail.
The construction of traffic engineering facilities is mostly in the later stage of construction, and there are often many related projects constructed at the same time, which need good coordination and cooperation, and detailed construction plan needs to be formulated.
2.2 quality supervision of corrugated beam guardrail 2.2.1 classification of corrugated beam guardrail: according to different road conditions and setting positions, the anti-collision performance requirements of corrugated beam guardrail are different.
When the concrete guardrail collides with the car, the guardrail does not move under the action of instantaneous moving load Obvious deformation occurs.
The construction scheme of traffic engineering, especially the installation and commissioning of some electromechanical equipment, has complex technology and involves many related disciplines, so careful preparation is needed , make a plan in advance.
① the process flow of corrugated beam guardrail components: forming → pickling → plastic spraying or galvanizing.
quality inspection of plastic spraying or galvanizing.
See table 13-1 for the application scope and design conditions of each anti-collision grade guardrail.
(3) Commissioning, inspection and acceptance after completion of facilities.
(2) Formulate supervision procedures and rules suitable for traffic engineering construction.
(2) Semi rigid guardrail.
According to different structures, beam guardrail can be divided into W-shaped corrugated guardrail, pipe beam guardrail, box beam guardrail, etc.
Design the construction process of each process Quality, control measures and methods, and prepare supervision implementation rules, which can be revised according to work needs in the implementation process.
From the actual application at home and abroad, corrugated beam guardrail is the most widely used.
Supervision can only be carried out by means of production process patrol inspection and finished product random inspection.
(2) Inspection and approval of process.
according to the drawings.
2.2.2.1 construction and supervision workflow of corrugated beam guardrail.
Rigid guardrail is a basically undeformed guardrail structure.
The test items and standards of the three control systems are not clearly specified, and the supervisor shall determine and implement them according to the design requirements and the specifications and standards of relevant industries.
The quality of corrugated beam guardrail first depends on its component quality.
2.1 brief introduction Guardrail is an important part of road safety facilities, which plays an important role in preventing traffic accidents.
inspection of specifications and dimensions of formed components; C.
1.2.2.3 supervision of construction process of traffic engineering facilities (1) Inspection and acceptance of purchased products.
The production of components is produced by the manufacturer in the factory.
Cement concrete wall guardrail is the main form of rigid guardrail.
(3) Rigid guardrail.
The supervisor shall first clarify each process of construction and installation and their mutual work sequence, connection conditions, etc.
The cable works within the elastic range and hardly needs more energy This kind of guardrail has a beautiful form and no sense of pressure when the vehicle is driving, but the line of sight guidance effect is poor.
② main Quality control links: A.
Therefore, procurement supervision should be one of the main tasks of transportation engineering supervision, including product market investigation, production capacity and reputation investigation of production suppliers, sampling inspection and evaluation of supplier products, etc.
It is a cement concrete wall structure with a certain cross-section shape, which absorbs collision energy by climbing or turning the front wheel of the car.
Combined with the characteristics of traffic engineering facilities construction, the supervision work shall include the following aspects.
According to the application scope of guardrail And anti-collision grade requirements.
The anti-collision performance of guardrails with different types of structures is different.
It is a structure fixed on the pillar with several cables applied with initial tension.
The main reason why the guardrail can reduce the severity of traffic accidents is to absorb the energy of vehicles through collision.
The supervisor shall cooperate with the construction unit and construction enterprise to organize the procurement bidding of transportation engineering equipment and equipment.
1.2.2.2 supervision contents of commencement preparations (1) Supervision of equipment procurement.
The engineering quality of transportation facilities mainly depends on the quality of purchased equipment and equipment.
The contents of traffic engineering drawings are often complex, including civil engineering, machinery, electrical and other contents, which need to be verified with each other.
2.2.2.2 supervision contents of corrugated beam guardrail (1) Confirm the production process and manufacturer of corrugated beam guardrail components.
(3) Determine the test items and prepare the test means.
See table 13-2.2.2.2 quality supervision of corrugated beam guardrail for the classification of corrugated beam guardrail.
(3) Implement construction personnel and construction organization equipment.
Therefore, it is very important to confirm its production process and the production capacity of the manufacturer.
Therefore, when investigating the manufacturer, it is necessary to confirm that the manufacturer must have the above good process, production equipment and facilities and perfect quality assurance system.
Its damaged parts are easy to replace, have a certain line of sight guidance, and have a beautiful appearance.
The guardrail set on highway subgrade is divided into class A and s according to the anti-collision grade; the anti-collision grade of median guardrail is divided into class am and SM.
they all have certain stiffness And toughness.
(2) Construction technical scheme and organization plan.
1、 Contents of quality supervision of traffic safety facilities (columns): The supervision of traffic engineering shall have the same working procedures as the supervision of other parts of highway engineering, and the principles of whole process control and scientific inspection must also be implemented.
