During the use of the bridge, any bridge will become an old bridge. Due to the limited understanding of pavement functions and diseases, early-built bridges often have problems such as too small reinforcement, too small steel diameter, and continuous unreliability of the contact surface between the pavement and the stressed member.
Because the bridge is not only affected by the natural environment (such as atmospheric corrosion, temperature, humidity changes, etc.), but also by the use environment, it is difficult to avoid damage. Which makesQingdao Bridge ReinforcementTransformation becomes inevitable.
1.Qingdao Bridge ReinforcementThe necessity of
(1) During the use of the bridge, any bridge will become an old bridge.
In the early built bridges, due to the limited understanding of pavement functions and diseases at that time, there were often problems such as a small number of steel bars, an excessively small steel bar diameter, and continuous unreliability of the contact surface between the pavement and the stressed members, and the reinforcement of old bridges has become inevitable.
(2) From the perspective of economic analysis, bridge reinforcement can save a lot of investment and receive good social and economic benefits.
Adopting appropriate reinforcement techniques and widening measures can avoid the increase in the cost of the removal of old bridges and the reconstruction of new bridges; and some can even be completed without interrupting traffic, and can also restore and improve the carrying capacity and capacity of the old bridge. The traffic capacity extends the service life of the bridge and meets the needs of modern traffic.
(3) Bridge reconstruction and reinforcement can not only improve the traffic capacity and service level of highway bridges, but also eliminate hidden traffic safety hazards to a large extent.
2.Qingdao Bridge ReinforcementThe basic conditions that the renovation project must have
(1) After reinforcement and reconstruction, the structural performance, bearing capacity and durability of the bridge can meet the requirements of use.
(2) It has obvious economic benefits. There are two different ways to strengthen the bridge structure
The first is to abandon the original structure for reconstruction, which is equivalent to building a new bridge that meets the new requirements, including the removal of the original bridge;
The second is to make full use of the original bridges and strengthen and widen them when necessary, commonly known as bridge technological transformation. It is generally believed that technological transformation can save more than 50% to 60% of cost, and the economic benefits are considerable.
3. Bridge deck pavement reinforcement
Cracking or spalling of the bridge deck pavement will make the reinforced concrete girder and slab bridge more prone to steel corrosion and weaken the bridge's lateral integrity.
Taking a stone arch bridge as an example, due to the infiltration of rainwater on the bridge deck, the water content of the filling material on the arch increases, resulting in leakage of the arch ring; at the same time, due to the damage of the bridge deck pavement, the bridge deck has poor flatness. When vehicles pass, the bridge will vibrate, which will adversely affect the bridge and aggravate the pavement disease. If the service life is long and the damage is serious, the dismantling and reinforcement plan should be adopted; but if the disease is lighter, the service life is shorter, and the concrete strength still meets the design requirements, the disease should be treated first. Without reducing the design load standard, The plan of laying asphalt macadam layer can be adopted.
