1499results about How to "Improve drainage capacity" patented technology

Vehicular pneumatic tire having an asymmetric tread formed in relation to a circumference of a running surface and process of making vehicular pneumatic tire. The vehicular pneumatic tire includes an outside region that includes an outside shoulder block row and an outside circumferential groove, an inside region that includes an inside shoulder block row and an inside circumferential groove, and a center region that is laterally delimited by the outside circumferential groove and the inside circumferential groove. A plurality of transverse grooves are arranged within the inside shoulder block row, and the plurality of transverse grooves further are arranged to extend into the center region. No more than about one-half of the plurality of transverse grooves are arranged to at least nearly entirely traverse the center region and are oriented to form an angle to a circumferential equator line of no more than approximately 30° over at least one-third of their longitudinal extensions. The process includes forming an outside region to include an outside shoulder block row and an outside circumferential groove, forming an inside region to include an inside shoulder block row and an inside circumferential groove, and laterally delimiting a center region with the outside circumferential groove and the inside circumferential groove. The process further includes arranging a plurality of transverse grooves within the inside shoulder block row and to extend into the center region. No more than one half of the plurality of transverse grooves are arranged to at least nearly entirely traverse the center region and are oriented to form an angle to a circumferential equator line of no more than approximately 30° over at least one-third of their longitudinal extensions.

The present invention provides a pneumatic tire which can obtain a high wet drainage performance, roadholding ability, and wear-resistant property without sacrificing other capabilities A directional pattern is formed by a circumferential wide major groove 14, a first narrow circumferential minor groove 16, a second narrow circumferential minor groove 18, a first transverse groove 20, a second transverse groove 22, and a third transverse groove 24. The circumferential wide major groove 14 is provided in a center region in a tire width direction of a tread 12. The first narrow circumferential minor groove 16 is arranged on the outside in a tire axis direction of the circumferential wide major groove 14. The second narrow circumferential minor groove 18 is arranged on the outside in the tire axis direction of the first narrow circumferential minor groove 16. The first transverse groove 20 is extended from a tread end 12E and coupled to the circumferential wide major groove 14. The second transverse groove 22 is arranged between the first transverse grooves 20, and the second transverse groove 22 is extended from the tread end 12E and terminated while not coupled to the circumferential wide major groove 14. The third transverse groove 24 is arranged between the first transverse groove 20 and the second transverse groove 22, and the third transverse groove 24 is extended from the tread end 12E and terminated between the first narrow circumferential minor groove 16 and the second narrow circumferential minor groove 18. Therefore, in wet road surface driving, the water between the pneumatic tire and a road surface flows efficiently into each groove to obtain high wet performance. Because the high wet performance is obtained while an increase in negative ratio is suppressed, a wheel tread area of a block is secured to improve a wear-resistant property. A circumferential length of a second block 28 becomes a substantial half of a first block 26, and circumferential lengths of a stepping-on side third block 30 and a kickout side third block 32 become a substantial half of the second block 28. Therefore, a wet drainage property can be improved on both sides of the tread while block rigidity is increased on a tread central region to improve traction performance, brake performance, and cornering performance. Furthermore, when the pneumatic tire of the invention is used in a front wheel, handling performance is improved by increasing the block rigidity in a central region in the tire axis direction. Widths and depths of the first narrow circumferential minor groove 16 and second narrow circumferential minor groove 18 are decreased from a kickout side toward a stepping-on side of the block in a range where the block is zoned by the first and second narrow circumferential minor grooves 16 and 18. Therefore, the block rigidity is increased on the stepping-on side of the blocks located on both sides of the first and second narrow circumferential minor grooves 16 and 18, and thereby the traction performance, brake performance, and cornering performance are improved.

A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

Dryer section of a machine for at least one of producing and processing a web of material. The dryer section includes at least one heatable drying cylinder having a circumference, at least a part the circumference adapted to be surrounded by the material web, at least one support band arranged to surround the at least a part of the circumference, and a sealing band arranged to surround the at least a part of the circumference. An overpressure cap is arranged to receive one of a liquid and gaseous medium and is adapted to apply a pressurized one of the liquid and gaseous medium on the at least one drying cylinder. A temperature of the medium is lower than a temperature on an outside of the part of the circumference. At least one second support band is arranged around the at least one drying cylinder and is positioned between the at least one support band and the sealing band, wherein the at least one second support band has a coarser structure than the at least one support band.

A gutter inlet automatic overflow pollutant intercepting device comprises a clamping seat. At least one extensible rod is connected with the portion below the clamping seat. The lower end of the extensible rod is connected with a metal support. The metal support and the extensible rod are sleeved by a filter screen. The gutter inlet automatic overflow pollutant intercepting device is characterized in that the clamping seat comprises a grease absorbing cable clamping groove. According to the gutter inlet automatic overflow pollutant intercepting device, pollutants entering a gutter inlet is intercepted through the pollutant intercepting filter screen, so that the gutter inlet and a rainwater pipeline are prevented from being blocked, and the water discharging capacity of a rainwater pipeline network is improved; the pollutants are controlled from a source through the rainwater pipeline network, so that disposing pressure of a sewage disposal plant and pollution to city water by runoff pollution are reduced. Grease type pollutants in runoff rainwater can be effectively controlled through the arrangement of a grease absorbing cable, so that the following disposing cost of the sewage disposal plant and the pollution of city water are reduced, and the gutter inlet automatic overflow pollutant intercepting device has obvious environment and economic benefits. According to the gutter inlet automatic overflow pollutant intercepting device, the structure of an existing gutter inlet is not changed, the improving cost of the gutter inlet is reduced, and the gutter inlet automatic overflow pollutant intercepting device is simple in structure, practical and low in production cost.

A carbon substrate for a gas diffusion layer that has a porosity gradient in a thickness direction thereof, a gas diffusion using the carbon substrate, an electrode and a membrane-electrode assembly for a fuel cell that include the gas diffusion layer, and a fuel cell including the membrane-electrode assembly having the gas diffusion layer are provided. The gas diffusion layer has improved water discharge ability and improved bending strength both in the machine direction and cross-machine direction.

A heat exchanger comprises first and second headers; a plurality of tubes each defining two ends connected to the first and second headers respectively. Each tube comprises a bent segment and straight segments connected to first and second ends of the bent segment respectively, the bent segment being twisted relative to the straight segments. A plurality of fins are interposed between adjacent straight segments. A length of the bent segment before bending satisfies a formula: 5tπ(180−θ)/180+2T_w≦A≦30tπ(180−θ)/180+8T_w , where: A is the length of the bent segment before bending, t is a wall thickness of the tube, T_w is a width of the tube, θ is an intersection angle between the straight segments of the tube, and π is circumference ratio. The heat exchanger of embodiments of the present invention is easy to bend and convenient to manufacture without reducing the heat exchange efficiency.

The invention discloses a construction method of a geogrid reinforced clay edge-covered tailing subgrade and belongs to the technical field of subgrades in the civil engineering. The construction method comprises the following steps: foundation treatment, sand gravel underlayer construction, laying of a two-way geogrid and water-permeable geotechnical cloth, feeding laying operations of clay edge-covering layers on the two sides of the subgrade and a tailing subgrade main body layer by layer, rolling construction, one-way geogrid construction between the tailing subgrade main body and the edge-covering clay to a designed elevation, and finally, the construction of an ash doped clay sealing layer. As the one-way geogrids are laid between the clay edge-covering layers on the two sides of the subgrade and the tailing subgrade main body, the defects such as differential settlement, poor subgrade stability and the like between the two fillers, namely the clay and the tailings, are reduced. The construction method has the advantages of simple structure, low cost and convenience for construction; besides, the consumption of the tailings and the overall stability of the subgrade can be increased, the differential settlement and the usage of the earthwork of the subgrade are reduced, rainfall infiltration and capillary water rise are decreased, and the internal drainage performance of the section of the subgrade is improved.

The invention discloses a drain-type pipe piece for tunnel lining. The drain-type pipe piece comprises a reinforced concrete pipe piece (1), a slurry injection hole (or a hoist hole) (1a) in the pipe piece (1), a load bearing steel bar (1b), and a concrete protective layer (1c) on the outer side; a water stop rubber block (2) capable of being expanded when being in contact with water is preburied in the concrete protective layer (1c) right opposite to one or two slurry injection holes (1a) of the pipe piece (1); a self-advancing type hollow anchor rod (3) is inserted in the slurry injection holes (or the hoist hole) (1a) of the pipe piece (1), then penetrates the water stop rubber block (2), and shoots out of the concrete protective layer (1c); and drain holes (3a) are formed in the rod wall of the outer end of the self-advancing type hollow anchor rod (3), and a filter column (4) used for filtering sand is plugged in the inner cavity of the self-advancing type hollow anchor rod (3). Lining built with the pipe pieces has a reliable drain function, and can reduce water pressure around the structure to ensure tunnel safety; and construction is convenient, small damage is caused to the pipe piece lining structure, and construction cost of the pipe piece lining is low.

In a present invention, in a pneumatic tire 1A, a circumferential groove 32 extending in a tire circumferential direction is formed by land portions 20 constituting a tread surface 10 coming into contact with a road surface. A flat groove portion 60 and an in-groove land portion 70 are formed in the circumferential groove 32. The flat groove portion 60 is a flat surface of a groove bottom 32a of the circumferential groove 32. The in-groove land portion 70 is raised toward the tread surface 10 side from the groove bottom 32a of the circumferential groove 32. Multiple narrow grooves 80 extending in a tread width direction are formed in the in-groove land portion 70. A wide-groove width W1 of the circumferential groove 32 in the tread width direction is 5 to 30% of a tread width TW of the tread surface in the tread width direction.

The invention discloses a debris flow gabion prevention and control structural body and a design method of the debris flow gabion prevention and control structural body. The flexible debris flow blocking structural body aims to overcome the defects that an existing permeable dam is limited in water permeability and is cracked and destroyed easily by over large instantaneous impact force. The debris flow gabion prevention and control structural body comprises at least one gabion dam prevention and control structural single body. Each single body comprises a lower steel pipe pile group and an upper gabion dam, wherein the steel pipe pile group is formed by arranging a plurality of steel pipe piles in the transverse direction of a debris flow channel, the lower pile bodies of the steel pipe piles are embedded into a debris flow gulley bed, and the upper portions of the steep pipe piles are exposed out of the gulley surface and are connected with the gabion dam in a penetrating mode. The multiple gabion dam prevention and control structural single bodies are arranged adjacently in the longitudinal direction of the debris flow channel. Through the optimization design, the gabion dam is of a multi-layer structure, each layer of the gabion dam is composed of a plurality of gabion nets, and the gabion nets of each layer are arranged in a staggered mode. The invention further provides the design method of the debris flow gabion prevention and control structural body. The debris flow gabion prevention and control structural body can fully utilize the water permeability of the gabion combined structure and deformation feedback of the gabion combined structure on the impact to achieve a good prevention and control effect.

The invention discloses a heat exchanger which comprises a first collecting pipe, a second collecting pipe, a plurality of flat pipes and fins, wherein the second collecting pipe and the first collecting pipe are positioned in a first plane and spaced with a preset distance; the first end and the second end of each flat pipe are respectively connected with the first collecting pipe and the second collecting pipe so as to communicate the first collecting pipe and the second collecting pipe through fluid; an included angle between the plane of the flat pipes and a second plane being orthogonal to the first plane is alpha, wherein alpha is larger than 0 degree and smaller than 90 degrees; and the fins are arranged between adjacent flat pipes. When the heat exchanger is used as a single cooling evaporator or a heat pump type heat exchanger, condensed water flows downwards along inclined surfaces of the flat pipes or the fins under the action of self gravity to leave the surface of the heat exchanger and cannot be gathered on the flat pipes and the fins, thereby improving the draining effect and improving the heat exchange performance.

A process for preparing a multi-element acidic soil conditioning agent from the alkali dregs and city sludge includes such steps as adding calcium lime to city sludge for stabilizing and disinfecting it, modifying the alkali dregs by (NH4)2HPO4, mixing them together, stacking to obtain compost, drying and breaking.

The invention discloses a side slope shallow drainage system. The bottom platform of the side slope (6) is provided with drainage ditches (4), and multiple rows and rows of drainage boreholes are densely arranged on the side slope (6). (1), the distance between the drainage boreholes (1) is 2-3m, the depth is 3-4m, and the elevation angle is 0-10°, each of the drainage boreholes (1) is provided with Drainage pipe, the slope of the slope (6) is arranged with a longitudinal micro-drainage ditch (2) and/or a transverse micro-drainage ditch (3) docked with the outlet of each of the drainage pipes, the The longitudinal miniature water collection ditch (2) and/or the horizontal miniature water collection ditches (3) communicate with the drainage ditch (4). The invention is a side slope shallow layer drainage system for quickly and efficiently discharging the groundwater infiltrated by rainfall into the shallow layer soil of the side slope.

The invention relates to a large-area soft soil foundation duplex negative consolidation processing method, comprising the following processes of: step 1, negative pressure consolidation: (a) paving plastic woven cloths in an area to be processed, driving a vertical plastic drainage board and a vertical plastic soak-away trench; (b) paving a main pipe and a branch pipe, wherein the vertical plastic drainage board and a transverse plastic drainage board are connected with the branch pipe; (c) paving a geo-membrane, and paving two to three sealing membranes on the geo-membrane; (d) excavating a side ditch pressing membrane; (e) installing a vacuum pump to vacuumize for negative pressure precipitation, wherein the main pipe is connected with the vacuum pump; step 2, well point dynamic arrangement: (a) inserting a well point pipe in a hole inserted by a vertical plastic soak-away trench or nearby the hole; (b) paving the branch pipe, the main pipe and the vacuum pump, carrying out the well point dynamic arrangement; and step 3, dynamic consolidation: a) precipitating and dynamically compacting in the first and second times, carrying out precipitation and dynamic compaction processes on the area to be processed for several times, carrying out multiple rounds of point compactions and finally carrying out a full compaction. According to the large-area soft soil foundation duplex negative consolidation processing method, the bearing capacity of the processed field is higher, the hard crust is thicker and the post-construction settlement is less.

A waterproof structure manufacturing method of a caisson-type toilet includes manufacturing of a basic layer, an overhead layer and a ground layer, has the advantages of being capable of effectively preventing the common problems that pipelines are broken, water is leaked due to the fact that connectors are not firm and water is accumulated through two-time waterproof structuring and two-time water-discharging structuring, avoiding the spring water phenomenon of the ground of the toilet, facilitating air drying of the toilet and preventing the toilet from being under a wet environment for a long time, and is suitable for the caisson-type toilet with a caisson which is 35-50cm deep.