Quality inspection and inspection of seamless steel pipes for making hollow bar micropiles

Hollow bar micropiles are made of seamless steel tube. The product quality of seamless steel pipe must be in accordance with product standards and technical specifications for a comprehensive inspection. Specific inspection, including chemical composition analysis of steel pipe, geometric size inspection, surface quality inspection, physical and chemical performance testing, process performance testing, metallographic analysis […]

Quality requirements of seamless steel tubes for making hollow bar micropiles

Sinorock is professional manufacturer in hollow bar micropiles, quality is core factor which can affect the service life of hollow bar micropiles. Seamless steel pipe is an important material for making self drilling hollow bar micropiles. As the working conditions and uses of seamless steel pipe is different, which has different requirements for its shape […]

Drill Hollow Bar Anchor’s Performance Test and Acceptance Test

Drill hollow bar anchor’s performance testing (also called destructive test or fundamental test) is to checkout designed drill hollow bar anchor’s performance before commencement of anchoring engineering. It aims to confirm drill hollow bar anchor’s ultimate bearing capacity and checkout drill hollow bar anchor’s working performance and safety degree under conditions of surpassing designed tension […]

The recessive benefit of anchor bolt

Anchor bolt is the most basic constituent part of tunnel support. It reinforces tunnel with surrounding rocks, realizing self-support. Now, anchor bolt can not only applied in tunnel, but also in engineering technology, having reinforcement for slope, mine, dam and infrastructure construction. Especially in fractured rock mass, the function of rock bolt is obvious. In […]

Underground Diaphragm Wall Features in Deep Foundation Pit Supporting Design

During excavation of deep foundation pit, underground diaphragm wall has functions of seepage-prevention, earth retaining and load bearing. Its specific features are as following: 1. Its stiffness is benefit for controlling deformation of foundation pit, especially for foundation pit engineering with narrow space and strict requirement in deformation. 2. It has strong impermeability and vertical […]

The Supporting Theory of Anchor Bolt

The application of anchor bolt in mining industry can track back to the 1930s. Belonging to active supporting, anchor bolt can transform surrounding rock of roadway into supporting body. It has strong adaptability and small deformation. It can ensure safety in production and has brought great economic and social benefit. There are several supporting theories […]

Basic Principles for Supporting Structure Design of Foundation Pit

Foundation pit engineering is systems engineering, belonging to temporary structure, which includes supporting system design and earth excavation, with strong integrity, strong regional, small safety stock and big risk. Supporting structure design of foundation pit should meet design requirements of 3 aspects: stability, strength and deformation. 1. Stability. It mainly refers to stability of surrounding […]

Expansion Shell Rock Bolting in TBM of Tunnel Construction

Diversion tunnel has characteristics of deep burial depth, high crustal stress and complex geological condition. Also, converging deformation is large at segment of deep burial depth, fault and crushed zones are many, joint is complex. So, it needs immediate support after excavation. During tunnel construction, mortar rock bolting can’t provide immediate support, supporting force of […]