59results about How to "Reduce sinkage" patented technology

The invention discloses a self-compaction filling paste body and a preparation process thereof, relates to a filling material with self-compaction performance for coal mine cut and fill mining and a corresponding proportion stirring process, and belongs to the field of construction materials. The self-compaction filling paste body is characterized by being prepared by uniformly mixing coal gangue, coal ash, cements, high-efficiency water reducing agent and water according to proper proportion, wherein the slurry concentration of the paste body is 75-85 percent; and in terms of mass percentage, the proportion of the coal gangue to the coal ash to the cements to the water reducing agent to the water is 45-55 percent to 15-20 percent to 10-15 percent to 3-5 percent to 15-25 percent. The paste body is high in flowability, stability and filling performance, low in bleeding rate and uniform and consistent in quality, and fully fills every corner of a worked-out section; the bleeding and the segregation of the aggregates are avoided; the convenience in transportation and control is achieved; a pipeline is not blocked during transportation; and original mine wastes are adopted for the paste body for realizing the filling so as to protect the environment.

The invention discloses a construction method for a soft surrounding rock section of a large-span tunnel portal. The construction method comprises the following steps of: excavating an arc-shaped pilot tunnel on the top of a tunnel section; performing initial support in time after the excavation process is finished and performing temporary support at the same time; excavating upper pilot tunnels on the left side wall and the right side wall at the same time; performing initial support in time after the excavation process is finished and performing temporary support on the core soil side wallsat the same time; excavating lower pilot tunnels on the left side wall and the right side wall at the same time, wherein the depth of circulation drilling for each time is 0.5 m; performing initial support in time after the excavation process is finished and performing temporary support on the lower parts of the core soil side walls at the same time; performing large core soil excavation; reserving core soil steps; installing inverted arch steel frames and injecting C25 concrete in time, so that the initial support of the whole tunnel forms a closed ring as soon as possible; and dismantling the temporary support. By the top arc side wall pilot tunnel construction method, vault subsidence can be favorably controlled; and the method is applicable to tunneling excavation construction for strongly differentiating a surrounding rock portal when the tunnel portal is under the protection of a large pipe roof section.

The invention relates to a coal mine strip mining and coal pillar filling and replacement method, wherein the method includes first-stage mining of mining of a strip working face and filling of a strip goaf area, and second-stage mining of replacement of the strip coal pillar and filling of the strip coal pillar goaf area. With the method of strip mining and coal pillar replacement, the mine recovery rate can be greatly increased to 60%-70%, and the ground subsidence amount of the mining area is greatly reduced, and the stability of an aquifer structure is maintained, so as to achieve the purposes of water conservation and coal mining.

The invention provides a method for filling a gob. In the filling process, when filling paste arrives at the position of an elastic baffle, a pushing device which is arranged on a tail beam of a hydraulic support pushes and pulls the elastic baffle back and forth to ensure that the filling paste refills the gob after being pushed to the gob which is not filled fully behind the hydraulic support; the pushing device is hinged with a pushing jack at the left end of the tail beam of the hydraulic support; the right end of the pushing jack is connected with the elastic baffle; and the filling paste is formed by uniformly mixing coal gangue, coal ash, a cementing material and water in the mass percent ratio of 45:20:15:20. According to the method, the pushing device which is arranged on the tail beam of the hydraulic support has a simple structure and is convenient to operate; and according to particle sizes and different ratios of components, the materials of the filling paste are convenient to transport and control, are condensed quickly and have certain expansibility and a good roof-contacting effect to ensure that surface subsidence can be effectively controlled.

The invention discloses a coal face paste-like filling method and a slurry-baffling device. The method mainly comprises the following steps: the slurry-baffling device is arranged on a breaking-off prop of a coal face; the traditional filling method is adopted to fill paste-like until the filling height of the paste-like is as high as the height of a slurry-baffling curtain, thus the mined-out region is completely filled; when filling work is finished and the paste-like is semisolid and does not flow, the next cycle of normal coal mining is performed; when one cycle is finished, the slurry-baffling device is recycled, then the breaking-off prop is drawn back; and when the working face reaches a filling interval, the above steps are performed circularly. By using the method of the invention, each filling height of paste-like is increased, the unsupported roof distance of the mined-out region is reduced, the filling effect of the mined-out region is improved, the roof pressure of the working face and the sinking amount of the overlying roadway are reduced, the surface zero subsidence is thoroughly realized, the problems of the flooding accidents of goal water and floor water and the spontaneous combustions of the mined-out region and the hillock are effectively solved.

The invention discloses a coal mining and filling integrated method for a coal mine. The method comprises the following steps: (1) digging out an air returning and filling pipeline lane, a boundary air lane and a transportation and air intaking lane of a mining region on a working surface of the mining region; (2) mining coal with a narrow strip channel in the working surface of the mining region, in which a ventilating system is formed, after coal mining in each narrow strip channel is finished, communicating the transportation and air intaking lane of the mining region with the air returning and filling pipeline lane of the mining region through narrow strip channels; (3) transporting coal mine cementing filling material slurry into a narrow strip channel excavating region formed after the coal mining in the narrow strip channels is finished for filling; and (4) mining the coal in the narrow strip channels while filling the narrow strip channel excavating region. The mechanical cementing, filling and milling method for the coal mining, disclosed by the invention, is beneficial to sufficiently developing underground coal resources, protecting the ecological environment and ground vegetation, releasing a large number of dull coal and prolonging the service life of a mine, and has remarkable economic benefits and social benefits.

The invention discloses a pumping-aiding device of an oil pumping rod and a sand blocking oil outlet sliding sleeve thereof. The pumping-aiding device of the oil pumping rod comprises a core rod, wherein the upper end of the core rod is connected with an upper connecting hoop; the lower end of the core rod is connected with a lower connecting hoop; the sand blocking oil outlet sliding sleeve can glidingly sleeve the middle part of the core rod and is a hollow step shaft; the hollow part is a step through hole; a first shaft section and a second shaft section are at least formed on the step shaft from top to bottom; the outer diameters of the first shaft section and the second shaft section are sequentially increased; a transition surface is formed between the first shaft section and the second shaft section; a lateral opening is axially and downwards formed in the place which contains the transition surface and is communicated with the step through hole to form an oil passage; the maximum inner diameter of the sand blocking oil outlet sliding sleeve is smaller than the outer diameter of the lower connecting hoop. According to the pumping-aiding device of the oil pumping rod and the sand blocking oil outlet sliding sleeve provided by the invention, pumping-aiding, sand-blocking and righting functions can be simultaneously realized, and the pumping-aiding device and the sand blocking oil outlet sliding sleeve are simple in structure.

The invention relates to a movable arm maintaining valve used for hydraulic excavators, which is installed between the bottom of a movable arm hydraulic cylinder and a movable arm control valve of a hydraulic excavator and mainly used for controlling the lifting, maintaining and descending of a movable arm. The movable arm maintaining valve comprises a valve block (1) opened therein with a first valve opening and a second valve opening and provided thereon with an overflow valve (44), wherein a piston (4), a valve stem (6), a left spring holder I (8), a spring I (9), a right spring holder (11) and a maintaining valve (14) are sequentially arranged inside the first valve opening from the left to the right, a core I (20) of the maintaining valve (14) is connected with the valve stem (6), the valve opening site where the valve stem (6) locates communicates with the overflow valve (44), a left spring holder II (29), a spring III (28), a right spring holder II (26) and a non-return valve (23) are sequentially arranged at the right side from the left to the right, the core II (25) of the non-return valve (23) are matched with the inner hole of the right spring holder II (26), and the left side of the second valve opening communicates with the rodless cavity of the movable arm hydraulic cylinder of the hydraulic excavator. The inventive movable arm maintaining valve can remarkably reduce the sinkage of the movable arm, so as to be safer and more reliable.

The invention belongs to the technical field of tire performance optimization, and discloses an inflation-free tire finite element simulation and performance optimization method which comprises the following steps: fitting tire rubber uniaxial tensile test data based on ABAQUS professional software, establishing a finite element model of an inflation-free tire, and carrying out finite element analysis on a supporting structure and a tread part of the tire. By increasing the arc radius of the non-pneumatic tire hole and reducing the number of the non-pneumatic tire supporting structures, the stress-strain concentration phenomenon can be effectively weakened, the fatigue damage probability of the supporting structures is reduced, and the performance of the non-pneumatic supporting structuresis improved. The hard elastomer layer with certain width and thickness is added between the supporting structure and the tread, so that the performance of the supporting structure of the non-pneumatic tire can be improved, the ground contact stress is uniformly distributed, and the ground contact performance of the non-pneumatic tire is improved. The optimal combination of the non-pneumatic tireis obtained by designing an orthogonal test, and the supporting structure and the grounding performance of the optimal combination non-pneumatic tire are greatly improved.

The invention discloses a construction method for a weak surrounding rock section of a short-step super-large-section tunnel, and belongs to the technical field of tunnel construction. The construction method comprises the following steps that S1, a top arc-shaped pilot tunnel is excavated; s2, middle steps on the two sides are excavated left and right; s3, excavating lower steps on the left side and the right side; s4, core soil is excavated; and S5, tunnel bottom excavation and inverted arch supporting are carried out. The construction method is high in safety, fast in construction progress, short in construction period, stable in supporting structure, short in forming time of each whole ring, large in construction space, convenient for mechanical deslagging, fast in construction effect and capable of effectively shortening the closed ring forming time.

The invention discloses a water-lubricated bearing for a pump and a water guiding tank molded line optimizing method. The water-lubricated bearing comprises an outer alloy sleeve and a rubber embedded sleeve with a self-lubricating action. The outer alloy sleeve and the rubber embedded sleeve constitutes the outer wall and the inner wall of the water-lubricated bearing correspondingly. The rubber embedded sleeve is composed of tanks and platforms, and intersecting angles of the water guiding tanks and the platform areas all have fillets. The spiral direction of a water guiding tank molded line is the axis rotating direction. According to the water-lubricated bearing, through the connection of the outer alloy sleeve and the rubber embedded sleeve, damping and protecting actions are achieved. The fillets at the bottoms of the water guiding tanks of the rubber embedded sleeve are designed, so that the residue and abrasion of water dregs are effectively avoided. The fillets at the tops of the water guiding tanks of the rubber embedded sleeve are designed, so that decompressing and abrasion reducing actions are achieved. Due to the water-lubricated materials and water guiding tank molded line characteristics of the water-lubricated bearing, at the time of starting, a certain time of dry friction can be allowed, and deformation fracture does not occur.

The invention relates to the technical field of constructional engineering, in particular to a soft foundation building foundation structure. According to the technical scheme, the structure comprises a plurality of pipe piles, rigid grouting pipes are arranged in the middles of the pipe piles, and the rigid grouting pipes are circumferentially connected with a plurality of sleeves; one end of the sleeve communicates with the interior of the rigid grouting pipe, the other end of the sleeve is fixedly connected with the side wall of the pipe pile, and a soil inserting rod is inserted into the sleeve; a piston ring is fixed outside the inner end of the soil inserting rod, the soil inserting rod and the piston ring can move in the sleeve in the direction away from the grouting pipe, and a plurality of grouting holes are formed in the side wall of the soil inserting rod. A slidable guide rod is arranged in the soil inserting rod in a matched mode, the inner end of the guide rod is fixedly connected with the rigid grouting pipe, and the length of the portion, inserted into the soil inserting rod, of the guide rod is smaller than the movable stroke of the soil inserting rod in the sleeve. The structural strength of the soft foundation and the bearing capacity of the foundation can be improved, the pipe piles and the foundation are connected to form soil piles, and therefore the sinking amount of the foundation piles and a building structure is reduced, and the safety of the building structure is ensured.

The invention provides an oven hinge with a two-section type transmission mechanism. The oven hinge comprises a hinge base and a hinged arm, wherein the hinge base is arranged on an oven door body, the hinged arm is mounted on an oven cabinet body, a hinged shaft hinged to the hinge base is arranged at the lower end of the hinged arm, the hinged shaft is installed at the position close to the inner wall of the bottom end of the hinge base, and the hinge base is provided with a two-section type transmission device; the two-section type transmission device comprises a sliding frame, a transmission elastic component and a power-assisted elastic component, wherein the sliding frame is arranged on the hinge base in a sliding mode, the transmission elastic component has a buffer door weight anddoor hovering function, and the power-assisted elastic component has a door body opening and closing function, so that two-section type power transmission can be provided by the hinge base during opening and closing, the transmission elastic component provides the torque force for balancing the weight of an oven body, the function of turning on and hovering an oven door body at any angle is achieved, a large door closing force is provided by the power-assisted elastic component, and the automatic closing function of the oven door body is realized.

The invention relates to a tunnel construction method. The tunnel construction method comprises the following steps that excavation construction is conducted on the part above an inverted arch of a tunnel through a double-side-wall pilot tunnel construction method; after the part above the inverted arch of the tunnel is excavated to a set safe distance, a temporary support is dismantled; after the temporary support is dismantled by a set distance, the inverted arch part of the tunnel starts to be constructed; and excavation construction of the part above the inverted arch of the tunnel, dismantling of the temporary support and construction of the inverted arch part are synchronously conducted until the construction of the tunnel is completed. According to the construction method, a transverse support does not need to be arranged, so that the operation space is increased; and the temporary support is not prone to breakage, so that the construction safety is guaranteed, and the safety is better than that of a traditional method.