Foundation support technology is the hot and difficult topic in the engineering field. Soil nailing is a new foundation support type, which can strengthen soil in situ. Soil nailing composed of dense soil nail groups and necessary waterproof system, is a technology with soil nails as the main force component. Soil nail is a slender bar used to reinforce or simultaneously anchor the in-situ soil. It is usually made by drilling holes in the soil, placing deformed steel bars, i.e. ribbed steel bars, and grouting along the full length of the holes. Soil nails bear passive forces under the condition of soil deformation and mainly bear tensile forces, relying on the adhesion or friction force between soils. The traditional soil nailing is passive support. Soil nails are only stressed after the soil has certain deformation, so prestress is generally not applied. Therefore, traditional soil nailing is not suitable for loose geological conditions such as silty sand layer, gravel layer and silty soil.
Kelleg’s self-drilling hollow anchor bolt has strong pull-out resistance and good solidity in bonding with soils. It can enhance stability of the bonding between soil nails and soil, and ensure the successful development of subsequent construction procedures. It can also replace solid soil nails such as steel bars and is suitable for various geology. Kelleg‘s self-drilling soil nail has the following significant advantages over solid soil nail:
1)One-step operation of drilling, installation and grouting, which simplifies construction process and reduces project cost;
2)Especially suitable for the support of easily collapsed and broken stratum, without using casing pipe, and the construction is simple and convenient;
3)Realize simultaneous drilling and grouting, thereby enhancing mechanical bonding with surrounding rock and soil.
4)The installation speed of hollow anchor bolt is twice that of the solid bolt, which significantly improves the construction efficiency.
5)Full length thread of anchor bar can be cut and extended on request, easy and flexible for on-site assembly.
6)It can also be constructed in narrow and limited places by using small drilling rigs, reducing construction costs;
7)Diversified drill bits are suitable for different types anchor bolts, which can be applied to various geological conditions.
As an effective anchoring product, self-drilling hollow anchor bolt has been widely used in advanced surrounding rock support, radial support, slope support, foundation support, roadway support, soil nailing support and other support projects for many years, and has been widely praised in the industry.
Kelleg is an enterprise integrating R&D, design, procurement, sales and customer service. Kelleg focuses on the field of geotechnical anchorage and continues to provide customers with engineering construction system solutions, high-performance products and professional technical support to make engineering construction safer and more efficient.