1723results about How to "Improve reinforcement effect" patented technology

This invention is A prepreg comprising a reinforcing fiber base material impregnated with a thermoplastic resin, wherein the reinforcing fiber base material comprises from 0 to 50% by mass of reinforcing fibers each having a fiber length of more than 10 mm, from 50 to 100% by mass of reinforcing fibers each having a fiber length of from 2 to 10 mm, and from 0 to 50% by mass of reinforcing fibers each having a fiber length of less than 2 mm, the average of two-dimensional orientation angles each formed by a reinforcing filament (a) and a reinforcing filament (b) intersecting the reinforcing filament (a) is from 10 to 80°, the thickness h0 (mm) at 23° C. is 0.03 to 1 mm, and the tensile strength σ is 0.01 MPa or more.The prepreg can be applied for thin molded products which have been considered unsuitable as a laminated molded product and can provide molded products that have a complicated shape and have isotropically high mechanical properties.

There is provided a pneumatic tire capable of achieving both reduced rolling resistance and enhanced durability and a method of producing the same. The pneumatic tire includes a reinforcement layer, formed of a steel cord coated with coating rubber, including at least one of a carcass, a bead reinforcement layer, a side reinforcement layer and a belt, with said coating rubber formed of a rubber compound containing 100 parts by mass of diene rubber, 30 to 80 parts by mass of silica having a nitrogen surface area of at least 70 m2 / g and at most 150 m2 / g, 1 to 15 parts by mass of a silane coupling agent, and organic acid cobalt salt. Preferably the steel cord has a cut edge of a breaker coated with an edge strip of rubber.

There is provided a medical catheter tube capable of exhibiting excellent flexibility, and provided a process for producing the same. In particular, there is provided a medical catheter tube having, arranged from a base edge side, a base part, a forefront part and a cutting edge part The medical catheter tube comprises an inner layer tube of resin pipe; a reinforcing material layer produced by knitting of a wire around the inner layer tube; a marker disposed by winding and covering of the inner layer tube at the forefront part with a roentgenopaque metal member; and an outer layer tube of resin pipe covering the reinforcing material layer and the marker. The inner layer tube, reinforcing material layer, marker and outer layer tube of the medical catheter tube are united together.

A pneumatic tire has a sidewall rubber insert axially inward of at least one carcass ply. Such insert may, for example, be an apex extending radially outward from the bead core region of the tire into the tire sidewall. Alternatively, it may be positioned higher in the sidewall portion of the tire and away from the bead core. Such insert is a rubber composition containing a dispersion of an ultra high molecular weight polyethylene and a dispersion of a starch composite.

The invention discloses a method for producing modified white carbon black. The method comprises the following steps of: A, adding water glass, water and a dispersing agent according to a proportion, stirring and heating; B, simultaneously dropwise adding concentrated sulfuric acid and 20 to 30-baume degree water glass into reaction equipment and determining that equivalent concentration of excessive Na2O of the water glass in reaction solution is 0.03 to 0.3; C, adding an activating agent and a modifying agent for reaction to generate modified hydrated silicon dioxide with amorphous structure; D, adding an acid to regulate the reaction solution; E, cooling, aging, filtering, washing, homogenizing and pulping; and F, drying and collecting with cyclone. In the method, the white carbon black is precipitated and prepared by using one-step process of dilute water glass and concentrated sulfuric acid, so that the production flow is simplified, the utilization rate of the equipment is improved, synchronous organic implementation of liquid-phase preparation technology and modification technology of the white carbon black is realized, and the dispersibility of project products and rubber reinforcement are improved; and by controlling the reaction process by the Na2O measuring method instead of a pH method, the control accuracy in the reaction process is improved, and stable and reliable product quality is guaranteed.

The invention discloses a vinyl silicon resin for reinforcing an organic silicon pouring sealant and a preparation method thereof. The preparation method comprises the following steps of: adding an appropriate amount of hexamethyl disiloxane and tetramethyl divinylsiloxane into a mixture of hydrochloric acid, an organic solvent and water to perform reaction for some time and then adding tetraethoxysilane and bis-functional or trifunctional siloxane to perform reaction; adding a certain amount of hexamethyl disiloxane and tetramethyl divinylsiloxane according to circumstances, standing and demixing after the reaction is finished, washing lower mixed liquor with deionized water until the liquor is neutral, and drying the liquor to obtain the vinyl silicon resin. The spherical core of the silicon resin prepared by the method, namely SiO2 has high content, and the spherical shell is tightly encircled by an R3SiO0.5 layer, so the silicon resin has good reinforcing effect; and the resin hashigh solubility or dispersibility in silicon rubber, can be separately used as a reinforcing filler for the organic silicon pouring sealant, and can also be matched with other fillers, so that the organic silicon pouring sealant with required performance can be obtained.

This invention is A prepreg comprising a reinforcing fiber base material impregnated with a thermoplastic resin, wherein the reinforcing fiber base material comprises from 0 to 50% by mass of reinforcing fibers each having a fiber length of more than 10 mm, from 50 to 100% by mass of reinforcing fibers each having a fiber length of from 2 to 10 mm, and from 0 to 50% by mass of reinforcing fibers each having a fiber length of less than 2 mm, the average of two-dimensional orientation angles each formed by a reinforcing filament (a) and a reinforcing filament (b) intersecting the reinforcing filament (a) is from 10 to 80°, the thickness h0 (mm) at 23° C. is 0.03 to 1 mm, and the tensile strength σ is 0.01 MPa or more.The prepreg can be applied for thin molded products which have been considered unsuitable as a laminated molded product and can provide molded products that have a complicated shape and have isotropically high mechanical properties.

The invention relates to preparation of EPDM-based and EPR-based rubber compositions which are vulcanized with peroxide together with a specified combination of sulfur and acrylate co-agents. The invention further relates to articles having at least one component thereof.

The invention relates to a solvent-type cold-patch asphalt liquid and a preparation technology therefor. The solvent-type cold-patch asphalt liquid comprises the following substances, by weight, 100 parts of petroleum asphalt, 10-15 parts of diluents, 10-15 parts of heavy oil, 10-15 parts of solvent naphtha, 1-5 parts of tackifier, 1-5 parts of strengthening agent, 0.2-0.8 part of surfactant and 0.5-0.8 part of anti-stripping agent. The above materials form performed polymers respectively and then are mixed uniformly, thus the obtained cold-patch liquid has good dispersibility, the stability of the obtained cold-patch asphalt liquid is raised, the storage stability is excellent, the employed tackifier, strengthening agent and anti-stripping agent can raise adhesion and strengthening effects of asphalt, and the surfactant can improve fluidity of asphalt substantially. The solvent-type cold-patch asphalt liquid is blended with aggregates when used to prepare cold-patch asphalt mixture for repairing pavement pits, no heating is needed during the blending process, the prepared cold-patch asphalt mixture has good initial and molding intensities and water damage resistance, and the construction workability is good.

The invention discloses a concrete hollow slab bridge reinforced by transverse steel beams. The concrete hollow slab bridge comprises a bridge deck beam constituted by arranging a plurality of hollow plate beams in parallel and at least one stiffening cross beam which is arranged on the bottom surface of the bridge deck beam and is used for transversely reinforcing the bridge deck beam so as to enable all the hollow plate beams to transversely transfer loads on the hollow plate beams, wherein the stiffening cross beam is fixedly connected with the hollow plate beams. According to the concrete hollow slab bridge reinforced by the transverse steel beams, disclosed by the invention, the overall structural strength is high, the bearing capacity of the bridge is strong, the single-plate stress can be avoided by reinforcing through the transverse steel beams, the service life of the bridge is prolonged, and the concrete hollow slab bridge has the advantages of simple structure construction, easiness in ensuring engineering construction quality, good stress performance, obvious reinforcing effect, convenience and quickness in construction, lower requirements for machines, tools and equipment required for construction and significant economic benefits, and is further conductive to popularization.

The invention discloses a fastened steel pipe concrete column confined by pre-stress and a reinforcement method thereof. The column is mainly applied to the reinforcement of a monolayer, multilayer or high-rise frame column which exceeds the limit value of the strength, rigidity or axial compression ratio. The basic principle of the invention is as follows: transverse pre-tensioning of a steel plate which is added to the surface of a rectangular or round reinforced concrete column is built up by screwing down a shear high strength bolt and the resultant force thereof acts on the surface of the reinforced concrete column; in accordance with the principle that acting force equals to counter acting force, the surface of the reinforced concrete column generates a counter acting force (positive pressure) towards the inner wall of the steel plate; in such way, friction force, which is corresponding to the positive pressure and is the so-called shear resistant bearing capacity in a project, is generated between the concrete surface and the inner wall of the steel plate, thereby achieving the loaded effect of the current steel pipe concrete column that is manufactured by casting concrete on the prepared steel pipe. Due to the existence of the transverse pre-stress, the mechanical effect of the steel pipe concrete column in the invention is better than the current one.

The invention discloses a tunnel connection channel construction method of a shield interval, which comprises the following steps: 1. an enclosed plain concrete continuous wall which is used as a water sealing curtain is arranged at the periphery of the connection channel ; 2. a mixing pile or grouting is adopted inside of the connection channel area to reinforce soil body; 3. excavating vertical well construction is carried out within the range of a reinforce area; 4. a subsurface excavation method is adopted to carry out excavation and lining construction for the connecting channel from both sides of the vertical well. 5. after the construction of the connecting channel interval is completed and a shield machine entirely passes through a reinforce body, a tube sheet positioned at the connecting channel portal is cut off, the portal waterstop and the portal structure of the connecting channel are constructed; the lining structure of the connecting channel positioned at the vertical well is also constructed and the vertical well is refilled, finally the connecting channel is completed; the stratum reinforce construction method of the connecting channel is high in efficiency and safe, can be promoted and applied to the construction of reinforcing stratum for changing the tool bits of the shield machine, thereby providing reliable guarantee for changing the tool bits of the shield machine.

The invention discloses a soft and weak wall rock tunnel advance reinforced support construction method. When a pipe roof advance support construction is carried out on one segment of the constructed tunnel, the construction method comprises the following steps: (1) support arch and guide pipe construction, wherein a plurality of guide tubes for carrying out guiding on a plurality of pipe roof pipes are arranged on a support arch; each pipe roof pipe comprises a pipe body and a drill bit; each pipe body is formed by splicing a plurality of pipe joints; each drill bit is coaxially arranged at the front end of the pipe body; the pipe joints are spiral steel pipes; the pipe roof pipes are first pipe roof pipes or second pipe roof pipes; and the first pipe roof pipes and the second pipe roof pipes are staggered; (2) drilling machine and slip casting machine installation and emplacement; (3) pipe roof advance support construction, which comprises the following processes: first pipe roof pipe drilling and synchronous grouting construction, final hole grouting construction of the first pipe roof pipes, second pipe roof pipe drilling and synchronous grouting construction and final hole grouting construction of the second pipe roof pipes. The method disclosed by the invention is simple in steps, reasonable in design, simple and convenient to construct and good in support effect; and the soft and weak wall rock tunnel advance reinforced support process can be simply, conveniently and quickly finished.

The invention discloses a vertical cup type freezing reinforcement structure and method at the shield tunnel end. The vertical cup type freezing reinforcement structure is multiple rows of vertical freezing pipes which are distributed in a soil body outside a working well at the shield tunnel end and are distributed to be shaped like a Chinese character 'kou', horizontal freezing pipes are arranged on the lower portion of the soil body on which the vertical freezing pipes are distributed in the working well at the end, refrigerant media are circulated in the vertical freezing pipes and the horizontal freezing pipes, and therefore a vertical cup type frozen wall reinforcement body can be formed in the soil body outside the working well at the shield tunnel end. The reinforcement method comprises the steps of step 1, freezing designing; step 2, refrigerating system designing; step 3, drilling constructing; step 4, freezing constructing; step 5, slot wall breaking; step 6, freezing pipe removing; step 7, frost heave and thaw subsidence controlling. The vertical cup type freezing reinforcement structure and method at the shield tunnel end has the advantages that a strata reinforcement mode for the end of a soft soil area which is rich in a water sand layer is achieved, the problem that in the area, a conventional reinforcement mode is poor in reinforcement effect can be effectively solved, and it can be guaranteed that a shield tunneling machine smoothly breaks in and out a tunnel portal.

The invention relates to a self-balancing external prestressing strengthening method for a bridge structure. The self-balancing external prestressing strengthening method is characterized by comprising the following steps of: carrying out interface processing at a connecting place (5) of a top flange of a concrete beam; (2) inserting reinforced bars at the connecting place (5) of the top flange of the concrete beam; (3) installing the reinforced bars at the connecting place (5) of the top flange of the concrete beam; (4) installing the reinforced bar of a steering block (6) and a diverter (9) at the bottom of the beam; (5) symmetrically adding diaphragm plates at a place far away from the end of the beam by 2-3m, and installing an anchorage device (10); (6) concreting the connecting place (5) of the top flange of the beam, the steering block (6) and the newly added diaphragm plates (8); and (7) installing and tensioning an anchoring external cable, thus obtaining a self-balancing external prestressing strengthening structure. An external prestressing system can be used for detecting and adjusting the stress of the cable at any time, inspecting the corrosion condition of the cable and can also be used for maintaining and replacing the cable when necessary. The self-compacting concrete solves the problems of dense reinforcement assembly, complex structure, narrow space of formworks and traditional structural members, cavities caused by the blocking of aggregates and the like, effectively ensures the dense degree of placing concrete and increases the strengthening effect. The self-balancing external prestressing strengthening method can be used for strengthening heavy railroad brides, concrete box girders and T beams.

A balloon catheter includes a long-sized body extending between a proximal end and a distal end, the body internally having at least one lumen, and a balloon made from a composite material composed of short-fibers for reienforcement and a matrix resin, the balloon being disposed on the distal side of the long-sized body. The short-fibers are oriented in the balloon in such a manner that in a longitudinal cross-section of the balloon, 25% or more of the short-fibers are oriented in the major-axis direction of the balloon, 25% or more of the short-fibers are oriented in the direction oblique to the major-axis direction, and the remaining short-fibers are oriented in the direction nearly perpendicular to the major-axis direction; and in a diametrical cross-section of the balloon, 8% or more of the short-fibers are oriented in the circumferential direction of the balloon, 25% or more of the short-fibers are oriented in the direction perpendicular to the circumferential direction, that is, in the major-axis direction, and the remaining short-fibers are oriented in the direction oblique to the circumferential direction. The balloon catheter exhibits a high strength to withstand pressure and a good trackability.

The invention relates to a preparation method of a supported rubber anti-aging agent and an application thereof. The preparation method comprises the following steps of: firstly preparing a solution with the mass concentration of 0.5%-30% from a silane coupling agent and an organic solvent, further mixing with an inorganic carrier to form a mixture with the solid content of 2%-80%, and performing stirring reaction for 6-24h at the temperature of 40 DEG C-100 DEG C; then adding the rubber anti-aging agent in the molar concentration which is equivalent to 0.6-1.5 times of that of the coupling agent into a reaction product, and reacting for 10-20h at the temperature of 50 DEG C-80 DEG C under the protection of nitrogen; and finally filtering, washing and drying the reaction product to obtain the supported rubber anti-aging agent. The supported rubber anti-aging agent can significantly improve the aging protection effect of the anti-aging agent against rubber, integrates the functions of a reinforcing agent, an interface modifier and the like, reduces the environmental pollution and migration of the rubber anti-aging agent, becomes a high-efficient, multifunctional and environment-friendly novel rubber auxiliary, and has extensive application prospects in the rubber industry.

The invention discloses a tetrafluoroethylene-propylene rubber / silicone rubber / chloroprene rubber composite sealing pad and a preparation method thereof. The tetrafluoroethylene-propylene rubber / silicone rubber / chloroprene rubber composite sealing pad is prepared from the following raw materials: tetrafluoroethylene-propylene rubber, silicone rubber, chloroprene rubber, magnesium methacrylate, 2, 4-dichloro-benzoyl peroxide, N, N'-m-phenylene bismaleimide, C5 petroleum resin, gas phase white carbon black, modified fluorite powder, nano-silicon nitride and the like. The tetrafluoroethylene-propylene rubber / silicone rubber / chloroprene rubber composite sealing pad disclosed by the invention selects the tetrafluoroethylene-propylene rubber with unique resistance to compression permanent deformation as a main raw material and takes the silicone rubber with excellent heat resistance, cold resistance, ozone resistance and atmospheric ageing resistance and the chloroprene rubber with excellent oil resistance and chemical corrosion resistance as auxiliary materials, the rubber sealing pad prepared by blending has the advantages of good sealing effect, good corrosion resistance, high cream content, capability of working for a long time in acid, base, oil and other media, small changes in volume and hardness and effect of being less prone to cracking, as well as excellent compression rebound resilience, high temperature resistance, cold resistance, aging resistance and the like, and the rubber sealing pad is durable.

The invention relates to a vacuum perfusion forming method of a p-aramid fiber composite material workpiece. The vacuum perfusion forming method specifically comprises the following steps of: (1) cleaning a mold; (2) painting a releasing agent; (3) respectively preparing resin glue for the gel-coat layer, resin glue for a surface layer and resin glue for perfusion; (3) manufacturing the gel-coat layer; (5) manufacturing the surface layer; (6) manufacturing a reinforcing layer which comprises p-aramid fiber cloth; (7) laying a vacuum perfusion device and sealing; (8) carrying out vacuum perfusion; (9) curing the workpiece; (10) demolding; (11) connecting a reinforcing member and a connecting piece; and (12) post-processing. The p-aramid fiber composite material prepared by the vacuum perfusion forming method provided by the invention is simple in production method and can effectively increase the ultraviolet resistance performance of the p-aramid fiber composite material workpiece; and simultaneously, p-aramid fibers and resin have a good caking property so that the composite has stable and good performances.

The invention discloses a construction method for enabling a shallowly buried and darkly excavated tunnel to pass through a cottage area. The construction method comprises the following steps: excavating a tunnel hole of the constructed shallowly buried and darkly excavated tunnel from back to front through a step excavation process, and performing preliminary bracing on the tunnel hole formed by excavating from back to front in an excavating process, wherein the tunnel hole consists of an upper guide hole and a lower guide hole positioned right below the upper guide hole, the rear part of the tunnel hole is connected with a vertical well, the preliminary bracing structure of the tunnel hole comprises a plurality of grating steel frameworks for supporting the tunnel hole from back to front, a layer of bar-mat reinforcement suspended on the inner wall of the tunnel hole and a concrete layer jetted on the inner wall of the tunnel hole. The process for excavating the tunnel hole of the shallowly buried and darkly excavated tunnel comprises the following steps: I, excavating the initial segment of the upper guide hole; II, excavating the initial segment of the lower guide hole; III, synchronously excavating the upper and the lower guide holes. The construction method disclosed by the invention is simple in step, reasonable in design, convenient in construction, good in construction effect, capable of simply completing the construction process of the shallowly buried and darkly excavated tunnel that passes through the cottage area, and safe and reliable in a construction process.

The invention relates to the field of engineering construction, aims to solve the problem of poor foundation reinforcement effect, and provides a soft foundation grouting pipe. The technical scheme isas follows that the soft foundation grouting pipe comprises a tube body, wherein the tube body is inserted into the end of the foundation to be closed, the side wall of the pipe body is fixedly provided with a telescopic pipe penetrating through the side wall of the pipe body, when the telescopic pipe is completely contracted, the end part extending out of the telescopic pipe is located in the side wall of the pipe body, the end part, extending out of the telescopic pipe, of the telescopic pipe is closed, a plurality of grouting holes are formed in the side wall of the telescopic pipe, and aone-way valve which only allows the cement grout to flow outside the telescopic pipe is arranged on the grouting hole. The invention further provides a foundation reinforcing and reinforcing method, the foundation reinforcing and reinforcing method comprises the steps that a drill hole to be reinforced is drilled and inserted into a grouting pipe, grouting and pumping grout are carried out, a grouting pipe is rotated, grouting is carried out again, pumping grout is carried out, a grouting pipe is taken out, and drilling is carried out. According to the soft foundation grouting pipe, the telescopic pipe extends out through the hydraulic driving of the grout, the telescopic pipe extends out, and the cement grout is injected into the foundation soil from the grouting holes, so that the grouting range is large, the distribution is uniform, and the foundation reinforcing effect is good.

The invention discloses a method for reinforcing a concrete column by expanding section with coated concrete-filled steel tube (CFST), comprising the following steps: (1) preparing for construction; (2) treating the surface of the concrete column; (3) planting steel bars around the concrete column; (4) coating steel tubes outside the concrete column and welding the steel tubes and the concrete column together; (5) welding the planted steel bars and the inner wall of the coated steel tubes together; (6) casting high performance micro-expansion concrete in the gap between the planted steel bars and the coated steel tubes; (7) protecting the outside surface of the steel tubes from corrosion and performing the exterior decoration. The method has a wide application range, thus being applicable to the structural damage caused by the physical ageing of the concrete column and the like, the destroyed structure caused by striking, fire, earthquake, and other disasters, or bad bearing capacity and rigidity of the concrete column caused by story-adding and the like.

The present invention relates to large area foundation treatment, and is especially process of treating large area soft foundation. The process includes the following steps: 1. arranging filter openings according to the stratum state; 2. inserting PVC filter pipes with filter pores in the calculated size into stratum, connecting the upper ends of the filter pipes beyond the soil layer to the main pipe and connecting the main pipe directly to the vacuumizing equipment; 3. vacuumizing based on the design requirement; and 4. withdrawing filter pipes after the soft soil layer consolidates and ramming to reach even high foundation strength. The process of the present invention has short construction period, less vacuum degree loss, saving in construction material and high foundation reinforcing effect.

The invention discloses a repairing and reinforcing method for a vertical shaft wall collapsed fiercely. The method includes the steps that a retaining wall is arranged outside an ingate at the bottom of the shaft and provided with a few drain holes; a collapsed fracture region of the shaft wall is detected; according to the detection result of a three-dimensional laser scanner of a goaf, the collapsed vertical shaft wall is divided into a collapse region, an upper cracking region, an upper affecting region, a lower cracking region and a lower affecting region, and elevation ranges of all the regions are determined; the shaft is grouted in a layered mode; an auxiliary temporary ventilating system is set up; tunneling and temporary supporting are carried out; a permanent shaft wall is constructed; collapse objects are cleared. The new reinforced concrete shaft wall is poured again to serve as the permanent support of a collapsed vertical shaft, a high-strength spring compressible layer is arranged on the lower portion of the new reinforced concrete shaft wall in the collapse region and allows the new shaft wall in the collapse region to deform vertically within a certain range, and long-term stability of the new shaft wall can be achieved. The repairing and reinforcing method for the vertical shaft wall is safe, reliable, short in construction period, practical and efficient.

The invention discloses a preparation method of nano-grade calcium carbonate. The invention belongs to the technical field of compound preparation. The method comprises steps that: S1, lime is digested; S2, a slurry obtained through digestion is sieved, and is then aged; S3, the aged slurry is carbonized; S4, the carbonized slurry is processed through primary cladding; S5, the slurry processed through primary cladding is subject to press-filtrating, drying, crushing, grading, and packaging, such that an intermediate product is obtained; S6, the intermediate product is subject to secondary cladding, such that a nano-grade calcium carbonate finished product is obtained. When the nano-grade calcium carbonate prepared with the method is used in RTV silicon rubber, the nano-grade calcium carbonate has both high dispersity and high reinforcing property.

The invention discloses a method for detecting low-concentration mercury ions based on a DNA modified SERS substrate. The method comprises the following steps: preparing uniform gold-covered silicon dioxide nano particles by a fractional step method and fixing nano particles with a core-shell structure on a quartz glass sheet by a coupling agent to construct an SERS substrate; modifying single-chain DNA molecules on the surfaces of gold shell layers of the gold-covered silicon dioxide nano particles through sulfydryls; immersing the prepared DNA aptamer modified SERS substrate into a solution containing the mercury ions; washing with de-ionized water; by taking an SERS signal specific value of a G basic group and an A basic group as spectrum standard measurement of DNA at a metal surface state, realizing quantitative and specific detection on the mercury ions by analyzing a characteristic Raman peak and the change of the specific value. Compared with the prior art, the method has the following advantages that the sensitivity of the method is high, the detection lower limit is about 50nM, the measurement operation is simple, the cost is low, and the real-time and rapid measurement can be realized.

The invention discloses a method to reinforce soft foundation based on gas pressing discharging and its gasbag. The method is: exhaust gas in cavity of inflatable body and put it into the reinforced soft foundation. Utilize inflatable body to press soil layer for a period of time and release gas in cavity when the soil layer reach density requirement. Take the inflatable body out of soil layer and fill the hole with soil. The gasbag in this method is composed of gasbag body with elastic multi-cavity and inserted link. The inner layer of gasbag is rubber and external layer is lyophobic textile. Both layers are adhered by glue. The invention has reused gasbag, small energy composing of pressing discharging, small composition of sandstone and low comprehensive cost. It has great concretion pressure, short reinforced time and good reinforced effect, which can be applied in reinforcing soft foundation of different fields and ranges.

The invention relates to a treatment method of large-area soft ground, in particular to a non-discharge sand cushion layer vacuum preloading method. The invention comprises the following steps: 1) installing drainage plates in a style of quincuncial piles in a treatment site; 2) replacing the horizontal discharging system of medium coarse sand cushion layer used in previous vacuum preloading construction with one of the two paving methods; 3) connecting the main pipe of the horizontal discharging system to a vacuum device, and carrying out vacuum pumping construction. The non-discharge sand cushion layer vacuum preloading method of the invention is suitable for reinforcement of large-area soft ground, more particularly have rather good effect on the reinforcement of dredger fill and recently deposited super soft soil; besides, the invention saves the investment of paving sand cushion layer, has good effect of vacuity transmitting; wherein, the horizontal discharging system with a paving way of combination of a steel spring tube, a tube plate connector and the drainage plates can realize large-scale finished product, normalized construction, short paving time, can be recycled and reused, and has the unique advantages of short construction period and being economical.