46results about How to "Reduced shear resistance" patented technology

The invention provides densifier and fracturing fluid for shale gas fracturing fluid, a preparation method and application thereof. The densifier is synthesized by viscoelastic surfactant, polyacrylamide, 2-propeneamido-methylpropanesulfonic acid, methacryloxy trimethyl ammonium chloride, N-isopropylacrylamide, pimeloyl and caustic soda flakes in a ratio of 3:(5-7):(0.4-0.6):(1-2):(1.5-2.5):(1.5-2.5):(0.8-1.2). The fracturing fluid comprises the densifier, a rheological aid mixed by surfactant and ethanol in a ratio of 1:(1.5-2.5), and a temperature stabilizing agent. The invention also provides application of the fracturing fluid in shale gas continuous sand fracturing and a shale gas continuous sand fracturing method. The fracturing fluid is clean fracturing fluid, has the characteristics of low hurt, effective thickening, temperature resistance, salt resistance, shearing resistance, low friction and the like, and is good in compatibility with other common water-borne fracturing fluid additives.

The invention discloses a low-damage and ultralow-concentration guar gum fracturing fluid system, a preparation method and an application of the guar gum fracturing fluid system and belongs to the technical field of reservoir reforming for oil-gas field development. In order to solve the problems that the existing conventional fracturing fluid systems hardly give attention to the lowering of concentration of a thickener, the prolonging of crosslinking time, the improving of gel strength and gelout capability and being environmentally friendly, a SITAR-11 powerful delayed crosslinker is selected, so that formed gel is endowed with a relatively high delayed crosslinking effect while heat resistance, shearing resistance and solid carrying capacity for the formed gel are guaranteed, and the concentration of the thickener is greatly lowered; and on one hand, the reduction of cost and the increase of economic benefit are facilitated, and on the other hand, the amount of gelout residues is reduced after the concentration of the thickener is lowered. Further, FANTA-05 and FANTA-06fracturing gelout enzymes, which are thorough in gelout and controllable in gelout time, and a ZITHE-34 efficient discharge aiding agent are added in a matched manner, so that the fracturing fluid system, which has a delayed crosslinking effect, is high in heat resistance and salt tolerance, excellent in solid carrying behavior, controllable in gelout time and thorough in gelout and is green, environmentally friendly and efficient, can be formed.

The invention relates to an elastic gel temporary plugging well killing fluid used in combination with a gas well and a construction process. The elastic gel temporary plugging well killing fluid comprises 1 # elastic gel and 2 # elastic gel, wherein the 1 # elastic gel comprises the following components in parts by weight: 1.5-3 parts of a temperature-resistant and salt-resistant polymer, 1.0-1.5parts of an organic cross-linking agent, 4-6 parts of an inorganic toughening agent, 0.2-0.5 parts of a stabilizer and 100 parts of water, and the 2 # elastic gel comprises the following components in parts by weight: 2-5 parts of a temperature-resistant and salt-resistant polymer, 1.0-1.5 parts of an organic cross-linking agent, 0.2-0.5 parts of a stabilizer and 100 parts of water. After the combined elastic gel temporary plugging well killing fluid is gelatinized, the pressure resistance is greater than or equal to 20MPa, and the theoretical filtration loss is less than 200mL / h, the performance stabilization time is longer than 30 days, the adsorption retention in places such as stratums and wellbores is effectively reduced while the high pressure bearing capacity is ensured, and the technical requirements for temporary plugging leakage prevention and reservoir protection of gas wells with relatively low stratum pressure coefficients are met.

The invention relates to a protection film. The protection film comprises a non-adhesive layer and an adhesive layer, and the non-adhesive layer comprises a surface layer and an intermediate layer; the surface layer of the non-adhesive layer uses a mixture containing homo-polypropylene (H-PP) and low density polyethylene (LDPE), the intermediate layer uses a mixture containing high density polyethylene (HDPE) and the low density polyethylene (LDPE)in a series of polyethylene (PE), and the adhesive layer is made by adding a low hardness plastic to a thermoplastic elastomer. The protection filmavoids the problem of melt adhesion due to cutter processing in the application process, and the good pasting and covering property and the uncoiling property of the protection film are ensured.

The invention discloses a rotary distributing axial impact drilling tool which comprises an upper joint. A supporting cylinder is axially fixed at the lower end of the upper joint, a drill bit seat is fixed at the bottom end of the supporting cylinder, a rotary support is fixedly arranged on the inner wall of the lower portion of the supporting cylinder, a cylindrical punch hammer is axially and slidably arranged on the outer wall of the supporting cylinder, an upper cavity and a lower cavity are hermetically formed between the supporting cylinder and the cylindrical punch hammer, an upper through hole and a lower through hole are respectively formed in the wall of the supporting cylinder and communicated with the upper cavity and the lower cavity, a turbine rotor drum with the bottom supported on the rotary support is axially arranged inside the supporting cylinder, turbine blades are arranged on the inner wall of the turbine rotor drum, a first sector through hole and a second sector through hole are formed in the outer wall of the turbine rotor drum and axially correspond to the upper through hole and the lower through hole respectively, and the first sector through hole and the second sector through hole are alternately communicated with the upper through hole and the lower through hole in rotation of the turbine rotor drum. The rotary distributing axial impact drilling tool is simple and reliable in structure, impact frequency and impact power can be increased, and rock breaking efficiency is improved.

The invention discloses a concrete micro crack reinforcing construction method. The construction method includes the following steps: (1) repairing cracks having the width of within 0.3 mm; (2) repairing cracks having the width of 0.3-0.5 mm; and (3) repairing through cracks. Moisture in concrete can be given outward completely, and in this way, the durability of a concrete structure can be greatly improved. It is worth mentioning that CM-DPS has excellent nano reinforcing bar performance, can provide anti-deformation and anti-tensioning performance of a concrete surface, and has absolute technological leading edge. The capillary crystalline protective layer can play a role in structure reinforcement, can play a role in connection such as adhesion, is simple in construction, and is reasonable in cost; and in addition, a reinforcing material has excellent anti-aging performance, can avoid decrease in cohesive property, anti-shearing ability and waterproof performance due to high temperature, rolling, lower temperature and frost.

A processing method for an electric connector includes formation, assembly and cut among which the formation step includes manufacturing terminals and insulation body and several terminal containing slots are set on the insulation body, the assembly step includes plugging the terminals into the insulation body many times in groups, in the process of continuously plugging two sets of terminals, the first group plugs into mutual gapped terminal containing slots, and the second plugs into two adjacent slots between the first group the two group bands are in different planes. The said two groups and the band are cut in one time after each time of plugging two groups.

The invention provides a municipal sludge fermentation aid and a use method thereof. The municipal sludge fermentation aid comprises 10-30 parts of coal ash, 20-50 parts of a chitosan derivative, 5-30parts of aluminum sulfate, 10-30 parts of a bio-enzyme, 5-30 parts of ferric trichloride, 20-50 parts of a zymophyte yeast, wherein the parts are 100 parts in all. The fermentation aid provided by the invention can be compounded with a biological flocculant zymophyte yeast, and in addition, is capable of dehydrating sludge before fermentation, and thus the situation that growth and propagation ofaerobic bacteria are affected because of too much moisture in the sludge can be avoided; due to adoption of inorganic and organic flocculants, a framework can be established inside the sludge to maintain fluid channels, the interference tension of solids and liquids can be reduced, moisture in sludge floc grids can be released, and deep removal of the moisture in the sludge can be facilitated; meanwhile, due to interactions of organic matters and zymophyte, the reaction process of compositing can be accelerated, and the compositing reaction time can be shortened; and the municipal sludge fermentation aid has the advantages that dehydration is rapid, the composting reaction process is accelerated, the composting reaction time is shortened, the requirements of users can be well met, and thelike.

The invention provides an assembled integral reinforced concrete coupled shear wall structure with key grooves. The structure comprises a prefabricated shear wall with a hole and cast-in-place edge assemblies combined with the two vertical sides of the prefabricated shear wall with the hole; the prefabricated shear wall with the hole includes dark columns, intermediate wall bodies and a connectingbeam connected with the dark columns on the two sides and the intermediate wall bodies, wherein the dark columns and the intermediate wall bodies are sequentially located on the two sides of the hole; the intermediate wall bodies are connected to the cast-in-place edge assemblies, and the shear-resistant key grooves are formed in the bottoms of the intermediate wall bodies. Vertical reinforced steel bars of the prefabricated shear wall with the hole are partially broken, the number of vertical reinforced steel bar connectors and grouting sleeves is decreased, a strengthening measure that thenumber of reinforcing bars of the wall bodies and cast-in-place edge assemblies on both sides of a prefabricated wall body is increased according to the principle of equal bending strength is adopted,and the loss of the bending-resistant bearing capacity due to the breakage of the vertically distributed reinforced steel bars can be compensated for, so that the factory manufacturing costs for materials and prefabricated components are reduced; moreover, through arrangement of the shear-resistant key grooves, the decline of the shear-resistant capability at horizontal seams between layers due to the breakage of the vertical reinforced steel bars in the prefabricated shear wall with the hole can be compensated for.

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide monomer, a nonionic-series monomer having a hydroxyl group and containing a double bond, a polyhydroxyl nonionic polymer template, a chelating agent and a molecular weight regulating agent with water to obtain a water solution; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the polyhydroxyl nonionic polymer template is less than 500000, and the structure formula of the polyhydroxyl nonionic polymer template is represented as the formula (I) or the formula (II). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

The invention discloses a steel-concrete hybrid beam combination section adopting corrugated steel plates for force transmission, and relates to the technical field of bridge engineering. The invention discloses a steel-concrete hybrid beam combination section adopting corrugated steel plates for force transmission. The steel-concrete hybrid beam combination section comprises a plurality of T-shaped stiffening ribs, a bearing plate, a combination section steel box and a plurality of corrugated steel partition plates. A plurality of T-shaped stiffening ribs are connected to one plate face of the bearing plate, the other plate face of the bearing plate is connected with a combination section steel box and a plurality of corrugated steel partition plates, and the corrugated steel partition plates are located in the combination section steel box. A plurality of oval through holes are formed in the corrugated steel partition plate, a plurality of perforated steel bars penetrate through theoval through holes in the corrugated steel partition plate, and the combination section steel box is filled with concrete. The oval through holes weaken the constraint effect of the steel partition plate on the concrete tenons in the holes, and the purposes that in the normal use stage, the corrugated steel partition plate is mainly used for longitudinal shearing resistance, and the oval hole PBLconnecting part and the steel partition plate are jointly stressed in the bearing capacity limit stage are achieved.

The invention discloses a low-permeability sandstone oil deposit chromium-aluminum ion compound profile control agent and a using method thereof, and relates to the field of oil field applied chemistry. The profile control agent is injected into a low-permeability sandstone oil deposit in a two-segmentation plug mode, a front-arranged segmentation plug is a polymolecular compounded-type polymer, and can be combined with insoluble suspending particles in the oil deposit to form a nuclear-surrounding type molecular clew type polymer, and selective plugging is conducted on oil deposit micro cracks and large pores; a rear-arranged segmentation plug is a low-viscosity compounded polymer, an appropriate amount of clay stabilizer and surfactant are added, profile control and displacement are conducted on an un-plugged area, the phenomenon that the clay of the low-permeability sandstone oil deposit expands can be inhibited, and the situation that wax, colloid and pitch are deposited in near-zone zones is avoided. According to the low-permeability sandstone oil deposit chromium-aluminum ion compound profile control agent and the using method thereof, the heterogeneity of the oil deposit can be improved, subsequent water drive waves and coefficients are increased, and forming of a low-permeability sandstone oil deposit dead oil zone is inhibited, so that the shortcomings in the traditional oil recovery method that the low permeability fracture oil deposit is low in recovery rate, poor in economic benefit and the like are improved.

The invention discloses gear hot-stamping equipment which is used for machining gears through a hot-stamping method. The gear hot-stamping equipment comprises a heating system, a stamping die, as well as a quenching tank, a turnover box and a conveying system, wherein the heating system is used for heating a blank material; the stamping die is used for stamping the heated blank material into a gear; the turnover box comprises a downwardly-inclined sliding chute and is used for guiding the hot-stamped gear into the quenching tank through the downwardly-inclined sliding chute; a cooling medium is contained in the quenching tank and is used for quenching the stamped gear; and the conveying system comprises a servo motor and a grab mechanism, and the servo motor controls the grab mechanism to convey the heated blank material into the stamping die and convey the stamped gear into the turnover box. Compared with the prior art, due to the adoption of the gear hot-stamping equipment, the service life of the stamping die can be prolonged, the production resources are saved, the production efficiency is increased and the machining accuracy and the service life of the gear are ensured, and further, the automatic production can be realized through an intelligent control system. In addition, the invention further discloses a corresponding gear hot-stamping method.

The invention discloses a bolt shearing force connecting piece with a weakened section. A screw cap, a threaded rod, a thread, a nut, a gasket and a plastic threaded rod sleeve are included. The threaded rod is provided with the screw cap. A symmetric necking-down rod section with the cross section area gradually reduced and then gradually increased needs to be machined in a threaded rod smooth rod section between the thread top on the upper side of a steel beam flange and the screw cap. When the bolt shearing force connecting piece serves as a shearing force connecting piece to be applied toa combined beam, the necking-down rod section needs to approach the position of an upper nut body of an upper flange of a steel beam, the threaded rod penetrates through a hole formed in the steel beam flange in advance and is fastened to the steel beam flange through the upper nut body and a lower nut body, and the gasket is arranged between the lower face of the steel beam flange and the lower nut body. According to the bolt shearing force connecting piece, the reliable anti-shearing strength of the bonding surface of the steel beam and a concrete panel is guaranteed, meanwhile, rigidity ofthe necking-down rod section is reduced, the deformation capability of the bolt shearing force connecting piece is increased, and brittle fracture of the bolt shearing force connecting piece is avoided; and a damaged position is induced to the transferred to the necking-down rod section, and deformation not facilitating later detachment is prevented from being generated to the steel beam and a bolt of the threaded rod section.

The invention relates to the technical field of buildings, and discloses a spliced composite slab structure. The structure comprises a first composite slab and a second composite slab; the first composite slab comprises a first prefabricated slab, a first cast-in-place composite layer and a first welded steel bar frame; the second composite slab comprises a second prefabricated slab, a second cast-in-place composite layer and a second welded steel bar frame; a first stressed steel bar assembly and a first connecting steel bar net are arranged between the first composite slab and the second composite slab; the first prefabricated slab abuts against the second prefabricated slab; and the first cast-in-place composite layer and the second cast-in-place composite layer are integrated by pouring. According to the structure, the first welded steel bar frame and the second welded steel bar frame are of integral grid steel bar structures and play a role in welding fixing so that the thicknessof the first prefabricated slab and the second prefabricated slab can be reduced when being manufactured, the anti-shearing effect is evenly achieved, a large number of steel bars do not need to be bound on site, the workload on a construction site is greatly reduced, and the construction efficiency is improved.

The invention discloses a rotary distributing axial impact drilling tool which comprises an upper joint. A supporting cylinder is axially fixed at the lower end of the upper joint, a drill bit seat is fixed at the bottom end of the supporting cylinder, a rotary support is fixedly arranged on the inner wall of the lower portion of the supporting cylinder, a cylindrical punch hammer is axially and slidably arranged on the outer wall of the supporting cylinder, an upper cavity and a lower cavity are hermetically formed between the supporting cylinder and the cylindrical punch hammer, an upper through hole and a lower through hole are respectively formed in the wall of the supporting cylinder and communicated with the upper cavity and the lower cavity, a turbine rotor drum with the bottom supported on the rotary support is axially arranged inside the supporting cylinder, turbine blades are arranged on the inner wall of the turbine rotor drum, a first sector through hole and a second sector through hole are formed in the outer wall of the turbine rotor drum and axially correspond to the upper through hole and the lower through hole respectively, and the first sector through hole and the second sector through hole are alternately communicated with the upper through hole and the lower through hole in rotation of the turbine rotor drum. The rotary distributing axial impact drilling tool is simple and reliable in structure, impact frequency and impact power can be increased, and rock breaking efficiency is improved.

The invention discloses a concrete micro crack reinforcing construction method. The construction method includes the following steps: (1) repairing cracks having the width of within 0.3 mm; (2) repairing cracks having the width of 0.3-0.5 mm; and (3) repairing through cracks. Moisture in concrete can be given outward completely, and in this way, the durability of a concrete structure can be greatly improved. It is worth mentioning that CM-DPS has excellent nano reinforcing bar performance, can provide anti-deformation and anti-tensioning performance of a concrete surface, and has absolute technological leading edge. The capillary crystalline protective layer can play a role in structure reinforcement, can play a role in connection such as adhesion, is simple in construction, and is reasonable in cost; and in addition, a reinforcing material has excellent anti-aging performance, can avoid decrease in cohesive property, anti-shearing ability and waterproof performance due to high temperature, rolling, lower temperature and frost.

The invention relates to a solid lubrication material used for a starter and a production technology, and an application method thereof, which relate to technical field of solid lubrication. The solidlubrication material comprises the raw materials: N-methyl pyrrolidone, MIBK, a gas-phase silica, silicon carbide, graphite, molybdenum disulfide, a BYK 399 levelling agent, polyamide-imide, epoxy resin, and isocyanate; and above raw materials are taken according to a metering ratio, and then processed by a production technology of the solid lubrication material used for the starter to obtain thesolid lubrication material. By employing the above technical scheme, the solid lubrication material has high adhesiveness, pressure resistance and chronergy, an operational temperature range is widerthan that of lubrication grease, a firm film is formed, high work load and sudden workload can be bear, when the solid lubrication material is not replaced after long-term usage, and the solid lubrication material can ensure the function of lubrication, prolongs the maintenance period, reduces the consumption, and reduce the maintenance and use cost.

The invention relates to the field of civil construction engineering, in particular to a grout sleeve with a function of coordination deformation with concrete for prefabricated components. The groutsleeve comprises a sleeve body, a grouting port and a grout outlet are formed in the sleeve body, and a convex groove and a reinforcing rib are arranged on the side wall of the sleeve body. Under thepremise that the ring rigidity of the sleeve is not affected basically, the grout sleeve with the decreased vertical rigidity and shearing rigidity can be used for a connecting position of the concrete prefabricated components. The rigidity of the positions, at the sleeve, of the prefabricated components (plate, beam, column and the like) is prevented from being increased excessively, component deformation is prevented from being excessively concentrated on concrete of the two ends of the sleeve accordingly, and a large crack is prevented from occurring to the concrete at the two ends of the sleeve; and the phenomena of short columns and deep beams can also be avoided.

The invention relates to a bar stock shear warm cutting system for forging an automobile engine connecting rod. The system comprises a bar stock shear mechanism for shearing an engine connecting rod bar stock, a high-speed heating device arranged near the bar stock shear mechanism for heating the engine connecting rod bar stock, a cooling device for cooling the high-speed heating device, and an electric cabinet used for controlling the high-speed heating device and the cooling device; the high-speed heating device is high-speed heating pass-type temperature control equipment, and the high-speed heating pass-type temperature control equipment is arranged on a channel in front of a bar stock shear of the bar stock shear mechanism; and the cooling device comprises a circulating pipeline, a plate heat exchanger, a water tank, a stainless steel water pump, a Y-shaped filter, an electric control valve, a water adding one-way electromagnetic valve and a liquid level controller. The system hasthe advantages that the shearing resistance of the heated engine connecting rod bar stock is reduced, a high-quality shearing section can be obtained after the bar stock is sheared by the bar stock shear, residual stress is eliminated, and cracks of the shearing section are avoided.

The invention relates to a building construction method, in particular to a reinforcing method for underwater concrete for blocking a gate of a hydropower station diversion tunnel, namely the construction method for the water blocking condition in the hydropower engineering construction process. The reinforcing method includes the main steps of (1) mounting a gate groove formwork and a gate top formwork, (2) mounting a concrete aggregate bin, a conduit and a lifting frame, (3) installing the inlet gate, (4) constructing the underwater concrete, (5) compounding the underwater concrete and preparing for pouring of the underwater concrete, (6) pouring the underwater concrete and (7) treating jamming and pipe blocking phenomena in time. According to the reinforcing method, drain pipes and a high wall are not needed in leakage stopping construction in the diversion tunnel, and the construction steps are simplified.

The invention discloses a system and a method for inducing and controlling landslide with compressed air. The system comprises a compressed air acting face, a set landslide body, a compressed air injection pipe, a compressed air distribution pipe, a pressure stabilization chamber, a pressure gage and an air compressor; the compressed air injection pipe extends to the compressed air acting face from the surface of the set landslide body, and is connected with the pressure stabilization chamber through the compressed air distribution pipe; and the pressure stabilization chamber is connected withthe air compressor through a pump chamber connection pipe. The landslide can be controlled manually, existing buildings below the landslide body are protected, or the generation of barrier lakes is avoided; the defects that mountain water resources and other materials are limited in the acquiring way, and are inconvenient to carry are overcome; and the effect of eliminating landslide hazard can be achieved only by using a simple device system, the construction amount is small, the construction and implementation costs are greatly reduced, environment pollution is avoided, the operability is high, and the application range is wider.

The invention relates to an elastic gel temporary plugging and killing fluid used in combination with gas wells and a construction process, including 1# elastic gel and 2# elastic gel; the 1# elastic gel includes: temperature and salt resistance in parts by weight 1.5-3 parts of polymer, 1.0-1.5 parts of organic cross-linking agent, 4-6 parts of inorganic toughening agent, 0.2-0.5 parts of stabilizer and 100 parts of water; 2# elastic gel includes: temperature-resistant 2-5 parts of salt-resistant polymer, 1.0-1.5 parts of organic cross-linking agent, 0.2-0.5 parts of stabilizer and 100 parts of water. The combined elastic gel of the present invention can resist pressure ≥ 20MPa after the temporary plugging and killing fluid is gelled, the theoretical fluid loss is less than 200mL / h, and the performance stability time is more than 30 days. , wellbore and other places to meet the technical requirements of temporary plugging and leakage prevention and reservoir protection of gas wells with relatively low formation pressure coefficients.

The invention discloses a guide barrel constitutive structure used for installation of a tread brake. In order to reduce impact from a bending moment caused by a brake shoe pressure of the tread brake to guide barrels, the guide barrel constitutive structure comprises at least an outer locking gasket, multiple outer sockets, multiple guide barrels, multiple inner sockets and at least an inner locking gasket, all of which are connected in series from left to right through multiple bolts; threaded holes are formed in the outer locking gasket, the outer sockets, the guide barrels, the inner sockets and the inner locking gasket; the multiple outer sockets, the multiple guide barrels and the multiple inner sockets are arranged in parallel. The guide barrel constitutive structure used for installation of the tread brake reduces impact from the bending moment caused by the brake shoe pressure of the tread brake to the guide barrels and also reduces shearing force borne by mounting bolts of the tread brake.

The invention belongs to the construction industry and particularly relates to a stiffening core cement-soil tubular pile, a construction method and a cylindrical rotary stirring drilling tool. According to the structure, a cement-soil tubular pipe body b is longer than a cored pile a, is as long as the cored pile a and is shorter than the cored pile a, and the center of the cement-soil tubular pile is soil. By means of the stiffening core cement-soil tubular pile, the construction method and the cylindrical rotary stirring drilling tool, the diameter of the cylindrical cement-soil pile can be larger. The completed pile with defects and with bearing force not meeting the design requirement can be reinforced through the method, the formed stiffening core cement-soil tubular pile is high in bearing force, uplift resistance and shear resistance, high in construction speed and low in cost, and people do not need to worry that the cored pile can not be inserted in the formed tubular pipe.

The invention discloses a connecting plate for abnormal-shape double-row piles. The connecting plate comprises a front row pile crown beam, a back row wall crown beam, a connecting plate body and structural steel arranged in a back row wall; the back row wall crown beam is internally provided with a plurality of first longitudinal bars, ring bars, large stirrups and small stirrups, the structural steel is sleeved with the ring bars, the large stirrups are bound on parts, located outside the scope of the width of wing edges of the structural steel, of the first longitudinal bars, and the small stirrups are bound on parts, located inside the scope of the width of the wing edges of the structural steel, of the first longitudinal bars; and the connecting plate body is internally provided with a plurality of second longitudinal bars, small U-shaped main bars and large U-shaped main bars, the ring bars are sleeved with the closed ends of the small U-shaped main bars in a pulling manner, and the closed ends of the large U-shaped main bars are arranged in the back row wall crown beam. According to the connecting plate for the abnormal-shape double-row piles, the problem that the main bars of the connecting plate body cannot penetrate the back row wall crown beam due to the fact that the structural steel penetrates the connecting plate body can be solved; and meanwhile, the problem that the anti-shearing bearing force and the anti-bending bearing force of the crossing position of the connecting plate body and the back row wall crown beam are seriously weakened after the structural steel penetrates the connecting plate body can be solved.

The invention provides calcium-tellurium synergistic gear steel as well as a preparation method and application thereof. The calcium-tellurium synergistic gear steel is prepared from the following components in percentage by mass: 0.40 percent to 0.43 percent of C, 0.23 percent to 0.28 percent of Si, 0.75 percent to 0.85 percent of Mn, 0.01 percent to 0.035 percent of S, 0.015 percent to 0.020 percent of P, 1.05 percent to 1.15 percent of Cr, 0.19 percent to 0.23 percent of Mo, 0.001 percent to 0.007 percent of Ca, 0.005 percent to 0.07 percent of Te and the balance of Fe and inevitable impurity elements. The preparation method of the calcium-tellurium synergistic gear steel comprises the following steps: smelting raw materials in a converter, refining in an LF (ladle furnace), refining in an RH (Ruhrstahl Heraeus) and continuously casting to obtain the calcium-tellurium synergistic gear steel. According to the calcium-tellurium synergistic gear steel provided by the invention, the deformation of manganese sulfide is limited, and the cutting lubricity is improved.

The invention discloses a cutoff mechanism of which the cutoff knife angle is adjustable. The cutoff mechanism comprises a wallboard A and a wallboard B, wherein a knife bed is arranged between the wallboard A and the wallboard B, and a cutoff knife is arranged on the knife bed. One end of a support plate A is connected with the back of the knife bed, and the other end of the support plate A is connected with a guide block A. A linear bearing A is arranged in the guide block A, and an inclined guide rod A is sleeved in the linear bearing A. One end of a support plate B is connected with the knife bed, and the other end of the support plate B is connected with a guide block C. A linear bearing B is arranged in the guide block, and an inclined guide rod B is sleeved in the linear bearing B. The invention further discloses a method for adjusting the angle of the cutoff knife in the cutoff mechanism of which the cutoff knife angle is adjustable. Compared with the conventional cutoff device, the cutoff angle of the cutoff mechanism can be adjusted. The cutoff resistance of the cutoff knife is significantly reduced, and the cutoff precision of paper is improved. The cutoff mechanism has the advantages of simple structure, safe operation, convenient adjustment and maintenance, convenient inspection and maintenance and low cost, and effectively reduces energy consumption.

The present application provides a calcium-tellurium synergistic gear steel and a preparation method and application thereof. Calcium-tellurium synergistic gear steel, calculated by mass percentage, including: C0.40%-0.43%, Si0.23%-0.28%, Mn0.75%-0.85%, S0.01%-0.035%, P0.015 %‑0.020%, Cr1.05%‑1.15%, Mo0.19%‑0.23%, Ca0.001%‑0.007%, Te0.005%‑0.07%, and the rest are Fe and inevitable impurity elements. Preparation method of calcium-tellurium synergistic gear steel: the raw materials are subjected to converter smelting, LF refining, RH refining and continuous casting to obtain the calcium-tellurium synergistic gear steel. The calcium-tellurium synergistic gear steel provided in this application limits the deformation of manganese sulfide and increases cutting lubricity.