导航栏
"QAIT" company has deeply engaged in the field of road and bridge engineering, providing an integrated service system covering the whole process and all projects. From the geological exploration and design planning in the project initiation stage - through professional technical analysis of basic data such as topography, geological structure, and hydrological conditions, and the completion of scheme design, risk assessment, and budget preparation to lay a solid foundation for project construction; to the construction of main projects such as roadbeds, bridges, and tunnels during the project implementation process, simultaneously promoting the construction of supporting projects such as drainage, protection, greening, and transportation facilities to ensure project quality and progress; and then to the subsequent maintenance and management services of the project, it builds a one-stop solution from project initiation to long-term operation, helping clients achieve full-cycle efficient management and sustainable development.
1.Road and Bridge Engineering Overview：
"Road and bridge engineering" is a general term for road engineering and bridge engineering, covering the planning, design, construction, and maintenance of transportation infrastructure such as highways, railways, urban roads, bridges, and tunnels. Its core is to solve the problem of transportation lines crossing geographical obstacles (such as rivers, valleys, towns, etc.) through reasonable engineering technologies, ensuring the safe and efficient passage of traffic.
2.Engineering Classification：
（1）Subgrade Engineering：
Subgrade engineering serves as the foundation of a road, bearing the traffic loads transmitted from the pavement. It involves tasks such as selection of subgrade filling materials, filling, compaction, as well as subgrade drainage and protection.
Subgrade Engineering
（2）Pavement Engineering：
It directly withstands the action of vehicle loads and natural factors, including the selection of various pavement materials, mix design, paving, rolling and other construction processes, such as asphalt pavement, cement concrete pavement, etc.
Asphalt Paving
（3）Bridge Engineering：
It includes bridge survey, design, construction, maintenance and inspection, etc., involving the construction of structures such as bridge piers, abutments, girders, and deck systems, as well as the construction of different types of bridges such as beam bridges, arch bridges, suspension bridges, and cable-stayed bridges.
Bridge Construction
（4）Culvert Engineering：
Structures used to drain water under embankments, mostly built at the intersection of roads and ditches, mainly including types such as circular pipe culverts, slab culverts, and arch culverts.
（5）Tunnel Engineering：
Tunnel engineering refers to the construction of underground passages for crossing mountains, rivers, or urban buildings, etc., including the construction processes such as tunnel excavation, support, and lining.
Tunnel Engineering
（6）Drainage Engineering：
Drainage engineering includes the construction of surface and subsurface drainage facilities, such as side ditches, drainage ditches, intercepting ditches, and infiltration ditches, etc. It is used to drain surface water and groundwater within the road scope, ensuring the stability of the subgrade and pavement.
（7）Protection Engineering：
Engineering measures taken to prevent the subgrade and slopes from being eroded and damaged by natural factors, such as retaining walls, slope protection, facing walls, etc.
（8）Greening Engineering：
Greening work such as planting trees and grass is carried out in areas like both sides of roads and median strips, playing roles in beautifying the environment, purifying the air, reducing noise, etc.
Road and Bridge Greening
（9）Transportation Engineering：
It mainly includes the installation of facilities such as traffic signs, markings, signal lights, guardrails, and isolation fences, etc., to ensure the safety and smoothness of road traffic.
（10）Electromechanical Engineering：
It involves the installation and debugging of electromechanical equipment such as lighting, ventilation, monitoring, and toll collection on roads and bridges.
Road Lighting
（11）Building Construction Engineering：
It refers to the building construction in road and bridge projects, such as toll stations, service areas, etc.
3.Construction Process：
（1）Preparation before Construction：
It includes work such as project feasibility study, preparation of project proposals, handling of project approval procedures, site investigation, formulation of design schemes, review and optimization of designs, formation of construction teams, procurement of materials and equipment, and leasing and debugging of equipment.
（2）Foundation Engineering Construction：
First, carry out site leveling and drainage treatment. Then, conduct pile foundation construction according to design requirements and perform quality inspection on the pile foundations. Next, carry out the casting and curing of the cap. Finally, carry out the construction and reinforcement of the pier (tower).
Road Compaction
（3）Installation and Debugging of Superstructure：
Transport and on-site assembly of prefabricated components, selection and implementation of appropriate main girder erection methods, bridge deck cleaning, construction and curing of the pavement layer, and installation of auxiliary facilities such as expansion joints and bearings.
（4）Setting of Road Traffic Safety Facilities：
Fabricate and install signs and plaques, carry out road marking and set up speed bumps, etc., install protective measures such as corrugated beam guardrails and reinforced concrete guardrails, set up night lighting facilities, and use reflective materials, etc.
Road Markings
（5）Quality Inspection and Acceptance Preparation：
Set quality inspection points at each stage, accept hidden works, sort out completion data, and conduct final inspection and confirmation before delivery for use.
（6）Formulation of Post-maintenance and Repair Management Plan：
Develop maintenance plans based on the types of roads and bridges, traffic flow, load conditions, etc., and regularly inspect, maintain, and repair roads and bridges to ensure their long-term safe and stable operation.
