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The invention discloses a construction method for a large-diameter assembled steel corrugated pipe culvert. The assembling construction of a corrugated pipe comprises the following steps of (1) arranging corrugated assembling culvert slabs in sequence in advance; (2) extending to the two sides with the midpoint of the central axis of the culvert as reference until reaching the two ends of an opening of the culvert; (3) assembling pipe culvert units: assembling each two corrugated assembling culvert slabs on the upper and lower sides of the corrugated pipe through butt-jointing the circular arc end surfaces; and closely pasting a rubber corrugated circular arc gasket and an arc steel plate on the circular arc internal side surface right against the butt-jointed seam from outside to inside; and fixing the rubber corrugated circular arc gasket and the arc steel plate through bolts; (4) detecting whether the section shapes and axis deflections of the assembled pipe culvert units reach standards or not; performing follow-up correction on the section shapes and the axis deflections of the assembled pipe culvert units; and performing once correction on the section shapes and the axis deflections of the assembled pipe culvert units; and performing once when every 5 meters pipe culvert is assembled; and (5) tightening all bolts by using an electric definite torque wrench according to a tightening force torque of 340 N.m + / - 70 N.m after the pipe culvert is completely finished. The large-diameter assembled steel corrugated pipe culvert, which is constructed by using the construction method, has the advantages of stable structure, high strength and high bearing capacity.

The invention provides a yarn covering machine, and belongs to the technical field of textile machines. The problem that an existing yarn covering machine is low in automatic degree and working efficiency is solved. The yarn covering machine comprises a workbench and a support. The support is located on the workbench. The workbench is provided with a feeding mechanism. A traction mechanism is arranged on the support. A plurality of vertically-arranged and synchronously-rotating rotating shafts are arranged on the workbench. Vertically-stretchable electric stretchable rods are fixedly connected to the rotating shafts. Spindles are fixedly connected to the tops of the electric stretchable rods. Two transmission rollers and a driving motor for driving the transmission rollers to rotate are arranged on the tabletop of the workbench. The two transmission rollers are connected through two conveyor belts arranged in a spaced mode. The electric stretchable rods penetrate through a gap between the two conveyor belts. The support is provided with placement holes for containing yarn coiling blocks from top to bottom. The placement holes correspond to the electric stretchable rods one to one in position. The yarn coiling blocks can be automatically taken and stored, and the working efficiency is high.

The invention relates to an online induction heating superficial-layer hardening process and device after the outer thread processing of a pipe end, belonging to the technical field of geological drilling pipe machining. The invention has the technical scheme that the process comprises the following steps of: machining the end thread of a pipe on a lathe, retreating a cutting tool under the condition of motionless pipe, sheathing an induction coil at the threaded end of the pipe, and moving an induction mechanism to heat and shallowly harden the end thread of the pipe. The invention has the advantages that the hardening depth is 0.4-0.8 mm and does not 20% of the thickness of a thin-wall working piece, the hardening effect of the working piece is ensured, and the working piece is also ensured to have certain toughness; the induction mechanism is directly installed on the lathe and is simple and feasible, and the hardening effect can be effectively ensured; the problem of non-concentricity brought by secondary card mounting is avoided, and the evenness of the hardening layer can be ensured; and the device has reliable action and sensitive response, and the shallow hardening quality is ensured.