Adopt the self drilling hollow bar for Tunnel project
Tunnel project is often launched in various kinds of complicated region,in order to make sure the stability of excavation surface and prevent the collapse of tunnels,self drilling hollow bar forepoling will be considered in advance,fore-small tube,grouting and other strengthening technology should be involved,especially in the condition of broken rock,loose soils,weak soils and sandy gravel as well as fine particles.
Pre-reinforcement determines weather the construction of tunnel and foundation perform well or not.
Shallow depth in the tunnel engineering, weak rock, joints fractured, poor self-stability ,it's difficult to form a balanced arch effect which occurs when a bassoon studio facilities are ready for challenge hole.
Self drilling hollow bar adopts steel tube and angle steel as its raw material and will be installed into the soil directly.There are a great many applications that self-drilling anchor and soil nail can be covered in,which contain clay and soft soil,hard plastic or solid
clay,dust,sandy gravel of consolidation or weak cementation,weathered rock and embankment and so on.
Reinforcement work and slope stabilization are the foundamental parts in the rock construction and has been extensively implemented in the mining,tunneling,hydroelectric project,water energy,retaining wall and other large rocking engineerings.
After decades of growth and development, industrial and civil buildings all over the world are entering a phase of gradual deterioration and aging, the demand for improved safety of existing in frastructure has rapidly increased. This is particularly the case in China.
The result increasing in the threat to safety as well as concerns about reliability has led to such building structures requiring continuous maintenance and repair. In seismic regions, such as south-western China, the structural deficiency of existing constructions are particularly acute problem, because of lacunae in construction knowledge and the design code.
In addition, as concrete structures become more complex, the self drilling hollow bar systems used to connect steel to concrete and concrete to concrete add to the problem. This had made it necessary to demolish aging buildings and to reconstruct them in a structurally satisfactory manner.
However, the direct and indirect costs involved in the demolition and reconstruction of structurally deficient constructions are often prohibitive. Therefore, structural retrofitting gets higher priority from engineers and is becoming increasingly the first choice ofaction.
