12 12 0
Self drilling bolt combines drilling, grouting and anchoring together, which has played a great role for the stabilization of projects. The density of grouting will directly influence the bonding degree between self drilling anchor bolt and structures. So, it should be controlled strictly. Concrete slump has direct influence for the quality of pile construction. Standard […]
2 12 0
Self-drill anchor combines functions of drilling, grouting and anchoring together, is an advanced anchoring system. While in stratum, it can’t avoid damage from corrosive medium. To ensure self-drill anchor’s long-term support effect, its corrosive environment should be surveyed adequately and the appropriate protective methods should be chosen. The principles for anti corrosion self drilling anchor […]
30 11 0
The design, construction and monitoring technology of deep foundation excavation have become big difficulties gradually. The supporting and protecting wall can not only ensure normal construction and stability, but also prevent deformation, soil body moving and normal operation of surrounding buildings, roads and underground pipelines. With the propulsion of reconstruction of old city, main high […]
17 11 0
In loose stratum, surrounding rocks would probably appear sloughing and roof falling. Grouting reinforcement refers that self drilling bolt is inserted into stratum along contour line of tunnel excavation and has certain extrapolation angle with hole axle. Self drilling bolt has dual functions, one is lead pipe shed function, the other is grouting pipe function. […]
28 10 0
Before construction of self drilling bolt, designers should firstly survey local geological condition, which mainly includes element, structure, state and character of rock and soil. As we know, underground water has corrosive effect on buildings, so water-physical property of rock and soil should be made clear to adopt anti-corrosion measures in time and prevent collapse, […]
21 10 0
Ground anchor, to be brief, is a supporting method to fix engineering structures on stable stratum. The essential requirements of ground anchor support: 1. Ensuring earth retaining effect of foundation pit maintenance system and making surrounding slope stable. 2. Ensuring safety of surrounding buildings, underground pipelines and roads. During excavation and construction, avoiding damages because […]
9 10 0
A contract of 85MW Nedre Otta hydropower plant in Sel and Vågå, Norway has been signed, which is worth NOK 657M (US$81 million). The hydropower project involves about 12,000m of tunnel work, construction of the power station and transformer hall and concrete work around the intake, power plant area, outflow and portal. Nedre Otta power […]
29 09 0
Self drilling anchor is one of important methods to sustain slope stability of rock and soil. Under ultimate load, self drilling anchor has grip force, frictional resistance between ground and anchor body, shearing strength of soil body, etc. 1. Self drilling anchor in soil layer. Shearing strength of soil body is smaller than rock’s and […]
19 09 0
Five potential routes for the proposed Sheffield to Manchester have been unveiled. The Department for Transport calls it the most ambitious road scheme undertaken in the UK for five decades. A feasible study released last year by Highways England that the project would include a tunnel section which could range anywhere between 20 and 30km. […]
8 09 0
1. Technical points of arranging self drilling anchor. Generally, constructors arrange self drilling anchor according to quite bigger angle between radial pattern tunnel section and main structural surface. When encountering imapparent main structural surface, constructors can arrange self drilling anchor vertical with tunnel surrounding contour and quincunx pattern on excavation surface. 2. Location of self […]