In order to control the tower deviation in cable hoisting process of long-span concrete-filled steel tubular arch bridge during construction monitoring, a practical method correction was studied and established. paper, based on studies about error formation mechanism lifting, relevant formulas rib elevation changes caused by change state were deduced. The traditional methods including increase ...

Abstract The surrounding rock of swelling soft roadway has high clay mineral content, strong expansibility after encountering water, low strength and poor cementation. is prone to large deformation under the influence complex geostress. Combined with support change development 2# coal in Hongqingliang mine, through geological survey, field observation indoor test, failure mechanism traditional ...

in this paper, a new approach to modify cable tension measuring mechanism is described; furthermore, the constructed boards which amplify load cell output are introduced. this approach has some advantages including of providing feedback for motors, evaluating the robot’s ultimate load carrying capacity, improving the motor control system and estimating the vibrating deflections of the end effec...

In order to solve the problem of surrounding rock control in soft coal seam roadway, taking centralized return airway No. 2 Liangdu Coal Industry as research background, mechanical conditions roadway were analyzed by means field investigation, mechanics experiment and numerical simulation. The design principles support put forward: high strength anchor cable support, preload stiffness support. ...

The load transfer mechanisms of cable bolts differ from those for normal rebar bolts. The cable bolts used in mines are basically steel strands with different constructions depending on the number of wires or elements and the way they are laid. Tendon bolts (rebar and cable) are normally evaluated for their strength and load transfer properties. The tendon strength can be evaluated by the tensi...

Aiming at the large deformation problem of U type steel support for the roadway in deep high stress soft rock, By means of theoretic analysis and digital imitation, study on U type steel support for soft Rock Roadway. A u shaped steel & anchor rope combined supporting structure was put forward ,with the help of numerical simulation analyzing the structural, results show that the structure contr...

in this paper robust pid control of fully-constrained cable driven parallel manipulators with elastic cables is studied in detail. in dynamic analysis, it is assumed that the dominant dynamics of cable can be approximated by linear axial spring. to develop the idea of control for cable robots with elastic cables, a robust pid control for cable driven robots with ideal rigid cables is firstly de...

A pressure sensor, located for four months in the middle of a 1275 m-long taut deep-ocean mooring 2380 m water depth above seamount with sub-surface top-buoys and seafloor anchor-weight, demonstrates narrow-band spectral peaks deterministic well-predictable signals equivalent 0.5 amplitudes at uncommon sub-harmonic frequencies f*/4, f*/2, 3f*/4 local near-inertial frequency f* = 1.085f, where f...