32results about How to "Shorten support time" patented technology

The invention discloses an automatic rod feeding device for a mine anchor rod drilling machine. The device comprises an anchor rod storing mechanism, a first manipulator, a second manipulator and a fixing seat. According to the device, an anchor rod is stored into semicircular grooves in an upper index plate and a lower index plate through the anchor rod storing mechanism; the anchor rod is grasped, conveyed and positioned through the first manipulator and the second manipulator; therefore, automatic conveying of the anchor rod is achieved; the replacing efficiency of the anchor rod and a drilling rod can be increased; the time of supporting the tunnel is reduced; the risk of collapse of the tunnel is reduced.

Movable equipment used for a down hole heavy support comprises a conveying track mounted in the supporting range of the heavy support, and the conveying track is formed by segmented tracks through connecting cards in a lapped and joint mode; on the side, where the heavy support is located, of the conveying track and in the position where the connecting cards are located; the conveying track is further fixed to a top beam of the roadway through a plurality of connecting chains located above, and the horizontal of the track surface is maintained; the two ends of the conveying track are provided with two curved track segments with opposite turning directions, and the track surfaces of the two curved track segments are maintained horizontal, and connected back to the track surface of the conveying track in return after being bent toward one side of the conveying track; and the conveying track is provided with a draft device, the draft device is provided with a connecting piece for installing the heavy support. According to the movable equipment used for the down hole heavy support, the need of the fast moving of the mine hole hydraulic pillar can be met, the labor intensity of the workers can be relieved, the security is improved, the production efficiency of the fully mechanized coal mining face is improved, and the drawback that a top plate is repeatedly supported by a traditional moving support can be avoided.

The invention discloses an integral casting process for a reinforced concrete wastewater tank in predrilling engineering. The integral casting process comprises the following steps of a, construction of a foundation and a bedding layer, digging a foundation pit, and casting the concrete bedding layer after determining that the foundation bearing force meets the design requirements; b, manufacturing and installation of reinforced bars, manufacturing and installing on site, wherein the overlapping length of the reinforced bars should not be less than 40 times of the diameter (mm) of each reinforced bar, and the overlapping area of the reinforced bars same in cross section should not be more than 50% of the total area; c, supporting of die plates, binding the die plates into the shapes of the bottom and the wall of a concrete tank; d, casting of concrete, after completing the construction of the reinforced bars and the die plates, carrying out the casting construction of concrete, firstly casting the bottom of the concrete tank and the wall with the height less than 1m, leveling the top of the wall of the concrete tank, and reserving no step to complete the first time of casing; casting the residual wall of the concrete tank in at least one hour after completing the first time of casting; and e, removal of the die plates, removing the die plates when the strength of the cast concrete being more than 1.2MPa. The integral casting process has the advantages that the construction time of the wastewater tank in the predrilling engineering is reduced, the construction period of the whole predrilling engineering is shortened, the condition of drilling machines not waiting for well fields is ensured, the construction seams are not reserved in the construction, and the leakage problem caused by the construction seams is avoided.

The invention relates to an incipient support method of a newly built tunnel, in particular to the incipient support method of the newly built tunnel applied to the field of supporting engineering under a geological condition of poor surrounding rock. The invention provides the incipient support method of the newly built tunnel which can restrain an oversized and distortional surrounding rock ahead and in time, reduce tunnel overbreak quantity, prevent safety risks of disengagement, reduce supporting amount and save investment. The method comprises the steps of a, arranging vertical steel bar holes along a tunnel excavation contour surface; b, steel bar blanking; c, cramming an anchoring agent; d, inserting vertical steel bars; e, connecting and fixing external exposed parts of the steel bars; f, excavating the tunnel; g, removing dangers; h, incipient concrete spraying support; i, supporting construction system anchor bolt; j, installing annular steel bars; k, installing steel frames; l, respraying concrete. The incipient support method of the newly built tunnel can restrain an oversized and distortional tunnel, reduce tunnel overbreak quantity, reduce steel frame support amount, reduce spray layer thickness, reduce incipient support time and reduce safety risks.