50results about How to "Improve pullout strength" patented technology

The steel bridge surface paving interface adhesive is for adhering spread layer to the steel bridge surface. The adhesive includes component an and component B in the ratio of 10 to 3-4. the component A consists of bisphenols A type epoxy resin CYD-128 in 90 wt% and phenol-phenolic epoxy resin-5 in 10 wt%; and the component B consists of polyamide-650 in 50 wt%, polysulfide rubber in 18 wt%, amine curing agent T31 in 30 wt% and coupling agent KH-550 in 2 wt%. The adhesive of the present invention has excellent tension resisting performance, excellent shear resisting performance, high heat resistance, high ageing resistance, and easy curing.

The invention provides an underwater solvent-free epoxy anchoring adhesive and a preparation method thereof. The underwater solvent-free epoxy anchoring adhesive consists of a component A and a component B in the weight percentage of 1:1, wherein the component A consists of the following components in parts by weight: 30-45 parts of epoxy resin E-44, 5-13 parts of epoxy resin E51, 3-8 parts of diluting agent, 0.5-0.75 part of coupling agent, 0.1-0.2 part of dispersant, 0.1-0.3 part of antifoaming agent, 0.4-3 parts of thixotropic agent, 20-30 parts of active micro silicon powder, 5-8 parts ofcalcium carbonate, 5.6-12 parts of quartz sand and 2-5 parts of aluminum oxide; the component B consists of the following components in parts by weight: 48-54 parts of completely-underwater epoxy curing agent 1085A, 44-50 parts of active micro silicon powder and 0.2-0.4 part of thixotropic agent; the diluting agent is benzyl alcohol; the coupling agent is ND-42 or KH 560; the dispersant is BYK P104S; the antifoaming agent is BYKA530; and the thixotropic agent is bentonite or white carbon black or a mixture of the bentonite and the white carbon black. The underwater solvent-free epoxy anchoring adhesive is prepared by mixing the prepared component A with the prepared component B in the weight ratio of 1:1.

The invention discloses a reamer bit which comprises a drilling unit and a reaming unit. The drilling unit and the reaming unit rotate synchronously along with a drill pipe. The reaming unit comprises a fixing portion, a locating ring and a reaming cutter. A guiding chute is concavely formed in the outer side face of the fixing portion and comprises a first inclining side wall and a second inclining side wall. The depth of one end of the guiding chute is larger than that of the other end of the guiding chute. The locating ring penetrates through the fixing portion and arranged on the fixing portion in a sleeved mode, a through hole is formed in the locating ring, and the reaming cutter is contained in the guiding chute and the through hole. When the drilling unit rotates forwards and conducts drilling, the reaming cutter abuts against the first inclining side wall and moves to one end of the guiding chute along the first inclining side wall, and therefore the reaming cutter is separated from the side wall of a hole. When the reaming unit rotates reversely, the reaming cutter abuts against the second inclining side wall and moves to the other end of the guiding chute along the second inclining side wall, so that the reaming cutter extends out of the through hole and conducts cutting on the side wall of the hole. The reaming cutter can cut the side wall of the drilled hole, so that the reamer bit has the advantage of reaming.

The invention discloses a medical vertebral arch pedicle renovating screw assembly which comprises a screw sheath and a screw which are mutually matched, wherein the screw sheath has certain mechanical strength and toughness, and the medical absorbable material can effectively maintain the mechanical strength for 2 to 3 months in vivo; the screw sheath is divided into a head end and a sheath body; the head end is a cone with a sealed front end, and the sheath body is a cylinder; external threads are arranged on the outer surface of the cylinder, and a longitudinally extended triangular prism-shaped cavity is arranged in the cylinder; the cylinder is divided into three side walls by the cavity, and internal threads are designed on the inner wall of the cavity; the screw is made of medical titanium alloy and comprises a thread section and a tail part; the thread section is formed by connecting a screw tip and a screw body, and both the screw tip and the screw body are in external threaddesign; the tail part is provided with a radially communicated U-shaped groove, and internal threads are arranged on the inner wall of the U-shaped groove. The invention can improve the internal fixation stability and reliability of the spinal column in a renovating operation or the secondary screw arranging process, reduce the occurring rate of vertebral arch pedicle screw loosening and even separation and lower the failure rate of operations.

The present application relates to a pre-embedded assembly of wall tie bars, including a pre-embedded sleeve pre-embedded in the wall and a tie piece connected to the pre-embedded sleeve. The inner peripheral wall of the pre-embedded sleeve is provided with a second A helical groove, the tie is a columnar structure, the outer peripheral wall of the tie is provided with a second helical groove, the first helical groove and the second helical groove are combined to form a helical cavity, and the helical cavity The inside is filled with a plurality of steel balls along its own spiral path. In this application, by setting the steel balls stuck between the first helical groove and the second helical groove at the same time, the pulling force on the tie piece is converted into the shear stress on the steel balls, and the structure of the steel balls is denser and stronger. , not easy to be crushed, and the steel ball can effectively resist the shear stress, thereby greatly improving the pull-out strength of the tie.

The invention relates to a three-stage anchoring combined type hollow anchor rod for grouting. The anchor rod comprises anchor heads, a metal pressure ring (4), a front connector (5), a solid twisted steel rod body (6), a rear connector (8), a hollow grouting anchor rod body (9), a stop-grouting plug (10) provided with an exhaust porous channel and an flexible exhaust pipe (7). The anchor heads comprise the main anchor head (1) and the subsidiary anchor head (2), the main anchor head (1) is provided with a helical blade with the diameter increased gradually, and the rear end of the subsidiary anchor head (2) is provided with a thread; the anchor heads rotationally penetrate through the metal pressure ring (4) and then are fixedly connected with the solid twisted steel rod body (6) through the front connector (5); the rear connector is used for fixedly connecting the solid twisted steel rod body (6) with the hollow grouting anchor rod body (9), a grout outlet is formed in the side face of the rear connector, and the grout outlet is communicated with the interior of the hollow grouting anchor rod body (9). By means of the three-stage anchoring combined type hollow grouting anchor rod, the three-stage anchoring effect with the novel anchor heads, an anchoring agent, the anchor rod and mortar acting in a combined mode can be achieved.

The invention discloses a cast-in-place pile structure. The cast-in-place pile structure comprises an anchor plate. Annular plates are arranged on the two sides of the anchor plate, the annular plates are formed by splicing two plate bodies, and the annular plates and the anchor plate are connected through pin shafts. The annular plates are provided with cast-in-situ bored piles, the number of the cast-in-situ bored piles is two, and the cast-in-situ bored piles are vertically arranged on the anchor plate. The top ends of the cast-in-situ bored piles extend to the outer side of the upper surface of the anchor plate, and the bottoms of the cast-in-situ bored piles penetrate through a pre-stressed anchor cable to extend to the outer side of the lower surface of the pre-stressed anchor cable. A main reinforcement bar is arranged between the two cast-in-situ bored piles, and the two ends of the main reinforcement bar are fixed on the cast-in-situ bored piles. A bag is further included, the top of the bag is placed on the lower surface of the anchor plate, and the bottom of the bag is placed on the inner bottom faces of the annular plates. A reinforcing plate is arranged at the connecting position of the bag and the main reinforcement bar. The cast-in-place pile structure is high in single-pile bearing capacity, high in pulling resistance, capable of enabling cast-in-place piles to be kept at the centers of pile holes as far as possible in the burying process, capable of avoiding excessive rod moving data, easy to construct, capable of driving piles into the earth conveniently, sturdy and durable, and capable of effectively achieving a reinforcement effect.