DEVICE FOR PERFORMING SOIL TEST FOR COMPRESSIBILITY WITH THE USE OF SCREW IMPRESS Russian patent published in 2005 - IPC

FIELD: construction, namely engineering surveying to be carried out during building and building structure reconstruction, particularly accelerated surveying methods.

SUBSTANCE: device comprises hollow pipe string parts screwing up in ground with the use of boring rig. Pipe string parts are connected with each other by thread connections and additionally with pins. Screw impress with tail piece and screw marker with case are mounted on lower pin so that they may perform limited axial movement. Auxiliary rod is inserted in pipe string interior up to reaching impress tail piece. Lower end of auxiliary rod is provided with load sensor cooperating with marker case. Sensors communicate with day surface. Hydraulic power cylinder is installed between swivel head shaft and connected with upper end of auxiliary rod through centralizer having cut for cable passing. Each pipe string part additionally has inner left-handed thread formed in right-handed outer thread and annular inner seat located at lower end thereof. Hollow nipple is freely installed inside each pipe string part. Nipple has mating left-handed thread made on lower end thereof and mating outer annular seat located on upper nipple end. The annular nipple seat has socket, for instance adapted for socket wrench receiving to tighten pipe string parts by means of left-handed thread by unscrewing right-handed one during impress and marker removal. Marker case is provided with taper collet secured to lower end thereof so that taper collet surrounds impress tail piece by springing blades thereof. Packing gland in installed in taper collet interior. Screw impress is secured to tail piece by coaxial connector and shear ring having shear resistance less than that of other tail piece connections.

EFFECT: increased reliability during device driving in soil and drawing out from soil and increased accuracy of obtained information.

2 cl, 6 dwg