35results about How to "Reduce jacking force" patented technology

The invention discloses a pump cap screwing machine, which comprises a rack, a power transmission device, a cap screwing assembly, a bottle body supply device, a first bottle guide device, a second bottle guide device, a bottle feed star wheel device, a bottle stopping device, a bottle discharge star wheel device, a cap supply device, a rotating air path distribution device and a bottle output device, wherein the first bottle guide device is arranged at the tail of a screw rod and is matched with the bottle feed star wheel device, and a bottle feed inlet is formed between the first bottle guide device and the bottle feed star wheel device; the bottle feed star wheel device comprises a bottle feed turntable and a bottle feed rotating shaft which is movably connected with the power transmission device, the bottle feed turntable is provided with bottle feed clamping mounts and the bottle feed turntable is sheathed on the bottle feed rotating shaft; the second bottle guide device is matched with the bottle discharge star wheel device, a bottle discharge outlet is formed between the second bottle guide device and the bottle discharge star wheel device and the bottle stopping device is connected with the bottle discharge outlet. The pump cap screwing machine has the advantages that the structure is simple, the production efficiency is high, the processes of cap conveying, cap grabbing and cap screwing can be finished in one step, the effect of multiple products on one production line can be realized and the cap screwing effect is good.

The invention discloses a midline deviation rectifying method for a sedimentary offset ballastless track. The midline deviation rectifying method comprises the following steps that (1) the uplifting quantity and the offset quantity of the sedimentary offset ballastless track line are determined; (2) the track structure characteristics are combined, a grouting uplifting hole is formed in the top surface of the ballastless track structure, and grouting uplifting material is injected into a ballastless track supporting layer or under a base plate through a grouting pipe installed in the grouting hole by adopting high-pressure grouting equipment under a certain grouting pressure according to the determined equipment parameters and the grouting steps, so that an overall ballast bed and the upper structure of the ballastless track are uplifted; (3) a jacking and pushing point is arranged on the side surface of the ballastless track structure, a jacking and pushing device is installed, and the ballastless track line is rectified to the designed position through the jacking and pushing process of grouping loading and jacking and pushing step by step; and (4) after the midline is rectified, the line recovery work is timely conducted, a lower gap of the overall ballast bed of the ballastless track is filled with a filling material, a fastener system is finely adjusted, and the line smoothness is recovered.

The invention provides a synchronous towing, pushing and tunneling device of underground box culvert or pipeline construction, relating the technical field of building construction machinery. The invention solves the technical problems of increasing suitability for a construction field, tunneling length and construction work efficiency. The synchronous towing, pushing and tunneling device comprises a push jack set, a tunneling machine head, a pull jack set and a plurality of cables, wherein the push jack set is arranged in a starting well, a cable reactive wall is arranged in a receiving well, the pull jack set is arranged on the cable reactive wall, at least four horizontal directional holes are drilled between the starting well and the receiving well along a designed axis direction, the cables are respectively laid into the horizontal directional holes, one end of each cable is connected and fixedly locked with the pull jack set in the receiving well, the other end of each cable is fixedly connected with the head of the tunneling machine head, and a cable self-locking mechanism which is used for stopping the cables is arranged on the pull jack set. The synchronous towing, pushing and tunneling device of underground box culvert or pipeline construction is suitable for various sizes of reinforced concrete or steel structure culverts or pipelines with rectangular and circular sections.

An underground water guiding and draining system under an impermeable membrane of an industrial waste residue storage yard is arranged in a mountain body (20) below a impermeable membrane (10) in a storage yard, and comprises a main guiding-leaking blind ditch (30), a branch guiding-leaking blind ditch (40) and a water guiding blind ditch (50), wherein the main guiding-leaking blind ditch is arranged at the lowest position of a valley, and the length of the main guiding-leaking blind ditch extends to the downstream of the storage yard along the tail end of the storage yard; the branch guiding-leaking blind ditch is arranged by surrounding the storage yard along the hillside surrounding the storage yard, a plurality of leaking water grooves for containing water leaking from the hillside are arranged on a guiding-leaking pipe in the branch guiding-leaking blind ditch, and a water outlet is arranged at one end of the branch guiding-leaking blind ditch positioned at the downstream of the storage yard; and the branch guiding-leaking blind ditch and the main guiding-leaking blind ditch are communicated with each other by a plurality of water guiding blind ditches or solid-wall HDPE (High-Density Polyethylene) water guiding pipes, which are arranged at intervals. The underground water guiding and draining system forms spider net shape under the impermeable membrane of the waste residue storage yard, so that underground water can be drained effectively, the support force on the impermeable membrane caused by underground water can be reduced, the upheaval and cracking of the impermeable membrane can be prevented, so that the completeness of the impermeable membrane can be kept, and the impermeable function of the impermeable membrane can be guaranteed.

The invention discloses an anti-rotary device of a single oil cylinder support boot. The anti-rotary device comprises an oil cylinder arranged between a middle shield and a tail shield in a connected mode, the support boot is arranged at the front end of a piston rod of the oil cylinder in a connected mode, and anti-rotary mechanisms are symmetrically arranged, at the two sides of the left-right symmetrical center line of the support boot, on the support boot; and each anti-rotary mechanism comprises a supporting piece and a keeping piece, wherein each supporting piece extends out the upper surface of the support boot and is matched with the inner surface of the tail shield in a contact mode, and each keeping piece is arranged on the support boot and drives the corresponding supporting piece and the inner surface of the tail shield to be kept in close contact elastically. According to the anti-rotary device of the single oil cylinder support boot, the supporting pieces at the left and right sides support at two left-right symmetrical points of the support boot, can be kept in close contact with the inner surface of the tail shield, and both generate rolling friction with the inner surface of the tail shield, rolling fraction force is large, rotating of the support boot is prevented effectively, it is ensured that the support boot cannot scratch the inner surface of the tail shield, the support boot cannot be in contact with duct piece seal, the probability of damage of the duct piece seal due to pushing is reduced, and the efficiency and quality of duct piece assembling is guaranteed.

The invention discloses a truss string structure internally provided with inclined guy ropes. The truss string structure comprises a top chord, a web member, knot sleeves, a lower cable and the inclined guy ropes, wherein the top chord is connected with the web member in a penetrating manner by way of welding, the lower end of the web member is connected with the knob sleeves, the lower cable penetrates through both rear ends of each knob sleeve and is fixed on support knobs at both ends respectively, the inclined guy ropes are symmetrically arranged, the lower ends of the inclined guy ropes are fixed on the support knobs and the upper ends of the inclined guy ropes are connected with the fixed knot of an upper cable; the fixed knot of the upper cable can be any intersection point between the top chord and the web member in a span scope of the truss string structure which is 1 / 5 to 1 / 3 far from adjacent support knobs. A pre-tress system which can provide bidirectional resistance is formed by the lower cable and the inclined guy ropes and the system can be suitable for wind suction loads. The truss string structure disclosed by the invention further has the advantages of small use level of steel products, simple structure, low preparation cost, good performance, easy construction and the like.

The invention discloses a steel cylinder concrete top pipe and a connecting method thereof. The steel cylinder concrete top pipe comprises an inner-layer reinforcing mesh, a steel cylinder, pipe core concrete, an outer-layer reinforcing mesh, a socket, a jack, an outer steel jacket, an anchor bar, a groove, an O-shaped sealing ring, a steel ring and a wedge-shaped sealing ring. The connecting method comprises the following steps of: adopting two steel cylinder concrete top pipes, mounting a wooden gasket on the end part of the socket of the first steel cylinder concrete top pipe, and adopting a pushing method to push the jack of the second steel cylinder concrete top pipe into the socket of the first steel pipe concrete top pipe; and enabling the second steel cylinder concrete top pipe to connect to the first steel cylinder concrete top pipe in a sealing mode through the O-shaped sealing ring and the wedge-shaped sealing ring. The steel cylinder concrete top pipe is relatively good in sealing performance, is uniform in grouting, is suitable for long-distance pushing and is small in influence on environment.

The invention discloses a pipeline maintenance and first-aid repair pipe clamp. The pipeline maintenance and first-aid repair pipe clamp comprises two arc-shaped frames, arc-shaped frame connecting end blocks, arc-shaped pressing blocks, sealing rubber pads, arc-shaped frame rubber pads, elastic universal supporting assemblies, two flexible cables, a plain hole connecting block assembly, a screw hole connecting block assembly and connecting bolts. The pipeline maintenance and first-aid repair pipe clamp is suitable for quick plugging of large-area leakage and cracks or penetrating holes of middle-high pressure pipelines and suitable for large pipeline deviation and deformation. The leakage plugging success rate is high, the weight is low, installation and adjustment are easy and convenient, and underwater construction is facilitated for divers.

The invention discloses an offshore wind power large-diameter steel pipe pile which comprises a steel pipe pile body and lifting lugs; the steel pipe pile body is formed by welding a plurality of steel pipe pile pipe sections in a butt joint manner; the lifting lugs are fixed on the outer wall surface of the upper half part of the steel pipe pile body; and a plurality of vent holes are uniformly distributed in the middle of the second steel pipe pile section below the pile top of the steel pipe pile body along the peripheral wall surface of the pile, and the vent holes are staggered from auxiliary components on the steel pipe pile body. According to the offshore wind power large-diameter steel pipe pile, the vent holes are formed, gas in the pile can be exhausted in time, the jacking forceof compressed gas in the pile on a hydraulic hammer can be effectively reduced, the situation that the hydraulic hammer is separated from the steel pipe pile during pile sliding is eliminated, and damage to a large construction ship and the large hydraulic hammer is avoided.

The invention discloses a pump cap screwing machine, which comprises a rack, a power transmission device, a cap screwing assembly, a bottle body supply device, a first bottle guide device, a second bottle guide device, a bottle feed star wheel device, a bottle stopping device, a bottle discharge star wheel device, a cap supply device, a rotating air path distribution device and a bottle output device, wherein the first bottle guide device is arranged at the tail of a screw rod and is matched with the bottle feed star wheel device, and a bottle feed inlet is formed between the first bottle guide device and the bottle feed star wheel device; the bottle feed star wheel device comprises a bottle feed turntable and a bottle feed rotating shaft which is movably connected with the power transmission device, the bottle feed turntable is provided with bottle feed clamping mounts and the bottle feed turntable is sheathed on the bottle feed rotating shaft; the second bottle guide device is matched with the bottle discharge star wheel device, a bottle discharge outlet is formed between the second bottle guide device and the bottle discharge star wheel device and the bottle stopping device is connected with the bottle discharge outlet. The pump cap screwing machine has the advantages that the structure is simple, the production efficiency is high, the processes of cap conveying, cap grabbing and cap screwing can be finished in one step, the effect of multiple products on one production line can be realized and the cap screwing effect is good.

The invention provides a double-L type pipe-roofing structure control box bridge jacking method. Firstly, L type pipe roofs at two sides are jacked, and secondly, a box bridge is jacked, so that a formed double-L type pipe roof is slidden in a slideway space, the jacking operation can be safely and accurately finished, and the technical problem that the operation of existed railway lines is not smooth due to the larger buncning tip phenomenon easily caused by a soft soil foundation during the jacking operation and larger side skylights at two sides of the box bridge during jacking existed in the prior art is solved.

A vertical circulation type intelligent stereo garage u-turning mechanism comprises a jacking device and a rotating device. The rotating device comprises a rotating fluted disc which is located on a base and is connected with and bears the jacking device and a motor reducing gear driving the rotating fluted disc to rotate. The jacking device is composed of a jacking lead screw installed on the rotating fluted disc, a synchronous belt wheel, a synchronous belt and a jacking motor reducing gear. The jacking device and a car containing plate are of a separated structure. Stable rotation and high operation efficiency are achieved, the jacking force of the jacking device is improved, and the internal garage space needed in the steering u-turning motion process of the u-turning mechanism is reduced. The u-turning mechanism is used for automobile u-turning when cars are stored in an intelligent stereo garage, a vertical circulation type intelligent stereo garage and a twin-tower vertical circulation type intelligent stereo garage.

The invention provides a saddle-ride-type vehicle, which can reduce running resistance generated due to running wind and seek to improve grounding pressure. An air guiding opening (65L) of an internal part (61L) is disposed at a mudguard bloating part (66L) at the back part of the vehicle. A main exhaust opening (71L) is disposed at an external part (62L), the main exhaust opening (71L) exhausts the running wind guided from the air guiding opening (65L) into a leg protection wind screen (60L). The main exhaust opening (71L) is disposed at the upper part of the air guiding opening (65L). The running wind flowing in the leg protection wind screen is exhausted from the main exhaust opening at the external side of the vehicle width direction. Therefore, no worry is needed for wind being left at the center of the vehicle width direction, and reduction of running resistance can be sought.

The invention relates to a ball-billet demolding device and a powder forming machine. The ball-billet demolding device comprises a pick and a buffer layer, wherein the pick comprises a horizontal section and an arc-shaped section, the horizontal section is connected to a shoe, so that the pick moves horizontally along with the shoe, and the arc-shaped section is bended downward and a concave surface of the arc-shaped section faces downward; the buffer layer is arranged on a convex surface of the arc-shaped section, and when the pick moves toward a ball-billet, the buffer layer is used for being matched with the ball-billet in a jacking manner to push the ball-billet out of a ball socket. As the arc-shaped section of the pick jacks the ball-billet, the ball-billet is subjected to an obliqueupward jacking force, so that the ball-billet can be pushed out from the ball socket with a small jacking force. As the buffer layer is arranged on the arc-shaped section of the pick, the buffer layer is matched with the ball-billet in a jacking manner to play a buffer role, so that the jacking force of the ball-billet is reduced, the ball-billet is prevented from being damaged, and the rejectionrate of the ball-billet during demolding is reduced. Furthermore, the ball-billet demolding device is relatively simple in structure, relatively low in cost and suitable for being popularized and applied.

The invention discloses a material returning structure of a blind flange forming die. The material returning structure of the blind flange forming die comprises an upper die set and a lower die set, wherein a die sleeve is arranged at the upper end of the lower die set; a positioning ring, a punch seat, a lower blank pressing concave die and an upper blank pressing concave die are successively arranged in the die sleeve from bottom to top; a limiting seat is arranged between the punch seat and the lower blank pressing concave die; a dowel is slidably arranged in the limiting seat; the tail of the dowel extends into the lower blank pressing concave die and is connected with a punch; a slide cavity is formed in the punch seat; the head of the dowel is slidably arranged in the slide cavity; a jacking cylinder is arranged at the lower end of the lower die set; a piston rod of the jacking cylinder penetrates through the lower die set and is connected with a material returning rod; the material returning rod successively penetrates through the positioning ring, the punch seat, the limiting seat and the punch from bottom to top and is propped against a blind flange which is arranged in the lower blank pressing concave die and the upper blank pressing concave die.

The invention discloses a slurry balance pipe jacking construction method. A slurry balance jacking pipe comprises a plurality of pipe joints, and the method comprises the following steps: anti-drag slurry is stirred on the ground, the anti-drag slurry comprises 13 wt%-17 wt% of bentonite, 0.5 wt%-1 wt% of sodium carbonate, 0.1 wt%-0.3 wt% of sodium carboxymethyl cellulose and the balance of water; soaking is carried out in anti-drag slurry and and in water; the anti-drag slurry is pumped between the outer wall of the pipe joint and the soil body, and a slurry ring sleeve is formed on the periphery of the pipe joint; the first pipe joint is jacked in place, grouting is stopped, and the first pipe joint is detached; a next pipe joint is installed between the first pipe joint and a heading machine, and grouting and jacking are conducted; and circulation is conducted till jacking of all the pipe joints is completed. A certain amount of anti-drag slurry is injected into the outer wall of the pipeline through the grouting holes in the pipe joints, the slurry ring sleeve is formed on the periphery of the pipeline, the friction force between the outer wall of the pipe joint and a soil layer is reduced, and therefore the jacking force during jacking is reduced.

The present invention relates to a method for reducing jacking force by using ring slurry guard cover in pipe-jacking construction of building engineering technology field. Said method includes the following several procedures: (1), reinforced concrete pipe-jacking machine utilization procedure; (2), gap utilization procedure; (3), using slurry-pressing equipment to feed the bentonite slurry into slurry-pressing hole; and (4) making the bentonite slurry be diffused into earth body. Said invention also provides the concrete steps of the above-mentioned every procedure.

A vertical circulation type intelligent stereo garage u-turning mechanism comprises a jacking device and a rotating device. The rotating device comprises a rotating fluted disc which is located on a base and is connected with and bears the jacking device and a motor reducing gear driving the rotating fluted disc to rotate. The jacking device is composed of a jacking lead screw installed on the rotating fluted disc, a synchronous belt wheel, a synchronous belt and a jacking motor reducing gear. The jacking device and a car containing plate are of a separated structure. Stable rotation and high operation efficiency are achieved, the jacking force of the jacking device is improved, and the internal garage space needed in the steering u-turning motion process of the u-turning mechanism is reduced. The u-turning mechanism is used for automobile u-turning when cars are stored in an intelligent stereo garage, a vertical circulation type intelligent stereo garage and a twin-tower vertical circulation type intelligent stereo garage.

The invention provides a double-L type pipe-roofing structure control box bridge jacking method. Firstly, L type pipe roofs at two sides are jacked, and secondly, a box bridge is jacked, so that a formed double-L type pipe roof is slidden in a slideway space, the jacking operation can be safely and accurately finished, and the technical problem that the operation of existed railway lines is not smooth due to the larger buncning tip phenomenon easily caused by a soft soil foundation during the jacking operation and larger side skylights at two sides of the box bridge during jacking existed in the prior art is solved.

The invention relates to a prefabricated assembly type concrete anti-floating inspection well and a machining method thereof, and mainly relates to the technical field of municipal engineering construction overhaul. The prefabricated assembly type concrete anti-floating inspection well comprises a prefabricated inspection well body, wherein the prefabricated inspection well body comprises a prefabricated well chamber, and the prefabricated well chamber is internally provided with an anti-floating mechanism used for introducing underground water into the prefabricated well chamber so as to reduce underground water level rise to generate jacking force to the prefabricated well chamber. According to the prefabricated assembly type concrete anti-floating inspection well, the jacking force generated by the underground water level rising on the prefabricated inspection well body can be effectively reduced, the uneven settlement of the prefabricated inspection well body is avoided, the flatness and the driving comfort degree of an urban road are increased, and the inspection well is safe and reliable in integral connection, and convenient and practical.

The invention provides a cable laying construction method. The method comprises the steps of 1, setting a pipeline for laying a cable; 2, arranging a cable jacking well and a cable receiving well, and carrying out pipeline jacking operation from the cable jacking well to the cable receiving well by adopting a pipeline jacking device underground so as to lay a pipeline; and 3, laying three cables A, B and C in the same loop into the same pipeline so as to realize the laying of the cables, wherein the pipeline is formed by inserting or welding a plurality of pipe sections. According to the cable laying construction method, the pipeline of the cable can be laid in a non-excavation ground mode, so that cable laying is achieved, and the excavation amount is greatly reduced. In addition, according to the method, the construction period can be greatly shortened, and the quality and the service life of the laid cable are guaranteed.

The invention relates to the technical field of punching shearing machining, in particular to a full-automatic punching shearing machine. The full-automatic punching shearing machine comprises a punching shearing platform, a transmission unit and a workbench, wherein the punching shearing platform is installed on the workbench, the transmission unit is installed at one position close to the workbench and comprises a base, motors, stirring wheels, top rods, supporting wheels, transmission belts and electromagnetic strips, the base is installed at one position close to the workbench, the surfaceof the base is symmetrically provided with through holes, and the side wall of the bottom end of the base is provided with first chutes, and the motors are installed to the base side walls close to the first chutes. According to the full-automatic punching shearing machine, by means of coordination of the punching shearing platform, the transmission unit and the workbench, the fixing function onblanks in the transportation process is enhanced, the friction force on the blanks on the surfaces of the transmission belts is enhanced, the situation that the blanks slide on the surfaces of the transmission belts due to the own gravity of the blanks is further avoided, so that normal work of the punching shearing machine is guaranteed, and the work efficiency of the punching shearing machine isimproved.

The invention discloses a pipeline maintenance and first-aid repair pipe clamp. The pipeline maintenance and first-aid repair pipe clamp comprises two arc-shaped frames, arc-shaped frame connecting end blocks, arc-shaped pressing blocks, sealing rubber pads, arc-shaped frame rubber pads, elastic universal supporting assemblies, two flexible cables, a plain hole connecting block assembly, a screw hole connecting block assembly and connecting bolts. The pipeline maintenance and first-aid repair pipe clamp is suitable for quick plugging of large-area leakage and cracks or penetrating holes of middle-high pressure pipelines and suitable for large pipeline deviation and deformation. The leakage plugging success rate is high, the weight is low, installation and adjustment are easy and convenient, and underwater construction is facilitated for divers.

The invention relates to the technical field of pipe jacking construction, in particular to a construction method for reverse obstacle clearing of pipe jacking, including construction measurement, structural reinforcement after jacking, installation of guide rails, reinforcement of obstacle areas, jacking of obstacle clearing pipes, and obstacle clearing Construction, reinforcement of the back wall structure after removal, guide rail modification, preparation for removal of the removal pipe, removal of the removal removal pipe, jacking of the original blocking pipe and other construction steps. The present invention pays attention to the soil support and reinforcement along the construction line before and during the construction, so as to reduce the occurrence of problems such as soil loss and subsidence in the process of clearing; The well advances in the same direction, which can reduce the jacking force of the original blocked jacking pipe, and reduce the impact of the obstacle clearing construction on the pipe jacking construction period; at the same time, according to the construction situation, the wall of the receiving well is reinforced multiple times to increase its bearing capacity. Ability to ensure the safe and orderly progress of the construction process.

Disclosed is a construction method for jacking of an overweight frame bridge at special geology. The construction method comprises the steps that a protective pile and a back pile are arranged; a foundation pit is excavated, and sliding plates with a plurality of longitudinal and transverse anchor beams on the bottom faces are manufactured; lubricating layers are constructed on the surfaces of thesliding plates; a back wall is arranged; a box is prefabricated; and jacking iron and a jack are arranged for jacking the box. The construction method has the effects that under the situation of overall jacking, the friction coefficients between the box and the sliding plates as well as between the box and a soil body are decreased, so that the overall jacking force of the box is decreased, meanwhile, series of measures control over the arrangement levelness and direction of the jacking iron are added, so that the overweight box is jacked in place smoothly, and safety is good; the position ofthe jacking iron is controlled through an infrared gradienter so as to ensure the accuracy of the position of the jacking iron; and through the construction method, the construction period can be shortened, the influence on the safety of a railway is reduced, and the jacking precision is improved.

The invention discloses a hemiplegia training assisting device for health care assistance, wherein the device comprises a bearing plate and a plurality of supporting blocks; the bottom of the bearing plate is fixedly connected with a plurality of first lifting rods, the tops of the plurality of supporting blocks are fixedly connected with second lifting rods, and the first lifting rods are inserted into the second lifting rods; and locking screws are fixedly connected between the first lifting rods and the second lifting rods. Through cooperative use of the bearing plate, a leg training frame, a moving groove, a training plate, a first threaded rod, a second threaded rod, a third threaded rod, a training shaft, a training spring and a top plate, a first threaded plate, a second threaded plate and a third threaded plate move rightwards by shifting a rotating handle, so that the force of the training spring on the top plate is reduced, the jacking force of the top plate to a training plate can be reduced by adjusting the rotating handle, then the jacking force to the legs of the patient can be controlled, and rehabilitation training of the legs of the patient can be achieved through progressive jacking force.

The invention discloses a truss string structure internally provided with inclined guy ropes. The truss string structure comprises a top chord, a web member, knot sleeves, a lower cable and the inclined guy ropes, wherein the top chord is connected with the web member in a penetrating manner by way of welding, the lower end of the web member is connected with the knob sleeves, the lower cable penetrates through both rear ends of each knob sleeve and is fixed on support knobs at both ends respectively, the inclined guy ropes are symmetrically arranged, the lower ends of the inclined guy ropes are fixed on the support knobs and the upper ends of the inclined guy ropes are connected with the fixed knot of an upper cable; the fixed knot of the upper cable can be any intersection point between the top chord and the web member in a span scope of the truss string structure which is 1 / 5 to 1 / 3 far from adjacent support knobs. A pre-tress system which can provide bidirectional resistance is formed by the lower cable and the inclined guy ropes and the system can be suitable for wind suction loads. The truss string structure disclosed by the invention further has the advantages of small use level of steel products, simple structure, low preparation cost, good performance, easy construction and the like.

The invention provides a bidirectional nut locking device and a combined roller. The bidirectional nut locking device is used for clamping accessories on a shaft and comprises a shaft shoulder, locking nuts, a driving mechanism and a fixing mechanism; the shaft shoulder is arranged in the middle of the shaft, and the locking nuts are arranged at the two ends of the shaft; the driving mechanism isused for driving the locking nuts to lock and sleeve the accessories on the shaft on the two sides of the shaft shoulder; and the fixing mechanism is connected with the shaft shoulder. Compared with the prior art, the locking device has the characteristics of high efficiency, simple and reliable structure, long service life and low cost, and is particularly suitable for application occasions witha narrow locking space for multi-slitting rolling of copper bars; and the combined roller adopts bidirectional locking to share the axial jacking force, so that the single-side minimum jacking force is reduced by 40%, the reliability of assembling the combined roller is greatly improved, and therefore the working capacity of the combined roller under the condition of the narrow designed locking space is improved.

The invention discloses drag reduction slurry, as well as preparation and use methods of same. The drag reduction slurry includes bentonite, an alkaline inorganic substance, polyacrylamide, and wateraccording to mass ratio of bentonite : alkaline inorganic substance : polyacrylamide : water = (290-295):(4-5):1:(645-655), wherein the alkaline inorganic substance is Na2CO3 and / or NaOH. The drag reduction slurry is excellent in water retention property, complete set performance, supporting and protecting performance and endurance, can be used for pipe jacking and shield tunneling and especiallyis suitable for high jacking force. During use, slurry injection frequency is reduced largely, and a slurry sleeve is effectively formed during the jacking process, thereby greatly reducing frictionresistance of outer wall of a pipeline and reducing jacking force during the jacking process, reducing cutter-head torque and working current, and reducing consumption of pipe jacking equipment.