An adjustable strand threading and lubricating device for prefabricated box girders includes an underframe. Multiple first spline shafts are rotatably installed between left and right side walls of the strand threading boxes. The first openings are respectively located above the first spline shafts, first sliding blocks are respectively provided and configured to slide up and down in the first openings, multiple second spline shafts is rotatably installed between two first sliding blocks, and axes of the second spline shafts are parallel to the first spline shafts. The first spline shafts and the second spline shafts are slidably provided with multiple strand threading units for threading steel strands, a lubricating unit is arranged on a front side of the strand threading units, and a bundling unit is arranged on a rear side of the strand threading units.

A link coupler for coupling two lengths of different sized chain together and facilitating movement of the two lengths of different sized chain is provided. Also provided is an assembly of the link coupler with a dual chainwheel, a small chain, and a large chain. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The dual chainwheel includes a small wildcat profile and a large wildcat profile. The small chain is coupled with the small-chain link coupler, and the large chain is coupled with the large-chain link coupler.

A link coupler for coupling two lengths of different sized chain together and facilitating movement of the two lengths of different sized chain is provided. Also provided is an assembly of the link coupler with a dual chainwheel, a small chain, and a large chain. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The dual chainwheel includes a small wildcat profile and a large wildcat profile. The small chain is coupled with the small-chain link coupler, and the large chain is coupled with the large-chain link coupler.

A yarn feeder may comprise a driver and a winding wheel. The driver has a front cover, a rear cover, a stator disc and a rotor disc, and the front cover and the rear cover are configured to fit together to form a housing therebetween which accommodates the stator disc and the rotor disc therein. The stator disc has a first through hole, and a plurality of teeth are formed around the first through hole to enable a couple of coils to be wound thereon. The rotor disc has a connecting hole, and a plurality of magnetic members are formed around the connecting hole. A connecting base extended from a first end of the winding wheel is engaged with the connecting hole, and the driver is connected to a tension controller to detect the tension of yarn and further to control the rotational speed of the driver.

Cable handling methods for securing and deploying or retracting one or more cables or hoses into or out of a pipe or cavity allowing inspection of the pipe or cavity are disclosed. In one embodiment a cable is inserted through a cable guide, a flex shaft is attached to the outer surface of the cable guide, and the cable and the flex shaft are deployed into a pipe or cavity to inspect and/or clear an obstruction via a jetter or cutting mechanism.

Provided is a method for manufacturing a combined yarn bundle including the steps of bringing the two or more carbon fiber precursor yarns which travel approximately parallel to one another into contact with a first roller at a wrap angle of 20 or more. Then, the two or more carbon fiber precursor yarns are split into two and brought into contact with a pair of second rollers, so that the carbon fiber precursor yarns are rotated approximately 90 between the first roller and the pair of second rollers. Next, the carbon fiber precursor yarns delivered from one second roller are brought into contact with a third front roller and a third rear roller, and the carbon fiber precursor yarns delivered from the other second roller are brought into contact with the third rear roller without bringing them into contact with the third front roller, so that these carbon fiber precursor yarns are combined on the third rear roller. Thereafter, the carbon fiber precursor yarns delivered from the third rear roller are brought into contact with a fourth roller to obtain a combined yarn bundle. A ratio of a distance L between axes of the first roller and of the pair of second rollers to a yarn width W of the carbon fiber precursor yarn on the first roller, L/W, is 18 or more and a tension of the combined yarn bundle after delivered from the fourth roller is 0.11 cN/dtex or more.

A compact, open path vertical cable pulling apparatus, having a low center of gravity and composed of two detachable, single person hand-portable components. The apparatus is competent to pull cable horizontally through space underground with a pulling force in the range of at least about 20 to 100 tons using low pressure flow hydraulics and has utility in the cable pulling industries, including in the drilling and horizontal directional drilling industries, and as part of a method for pulling cable through space, including pulling cable through space in the pipe bursting and trenchless pipe replacement industries.

A compact, open path vertical cable pulling apparatus, having a low center of gravity and composed of two detachable, single person hand-portable components. The apparatus is competent to pull cable horizontally through space underground with a pulling force in the range of at least about 20 to 100 tons using low pressure flow hydraulics and has utility in the cable pulling industries, including in the drilling and horizontal directional drilling industries, and as part of a method for pulling cable through space, including pulling cable through space in the pipe bursting and trenchless pipe replacement industries.

A compact, open path vertical cable pulling apparatus, having a low center of gravity and composed of two detachable, single person hand-portable components. The apparatus is competent to pull cable horizontally through space underground with a pulling force in the range of at least about 20 to 100 tons using low pressure flow hydraulics and has utility in the cable pulling industries, including in the drilling and horizontal directional drilling industries, and as part of a method for pulling cable through space, including pulling cable through space in the pipe bursting and trenchless pipe replacement industries.

A compact, open path vertical cable pulling apparatus, having a low center of gravity and composed of two detachable, single person hand-portable components. The apparatus is competent to pull cable horizontally through space underground with a pulling force in the range of at least about 20 to 100 tons using low pressure flow hydraulics and has utility in the cable pulling industries, including in the drilling and horizontal directional drilling industries, and as part of a method for pulling cable through space, including pulling cable through space in the pipe bursting and trenchless pipe replacement industries.