220 results about "Soil reinforcement" patented technology

A three piece concrete culvert system includes a set of horizontally spaced precast side wall sections having inwardly projecting and opposing steps or surfaces which support opposite ends of a precast arched top wall section. The side wall sections include extension portions which project substantially above the ends of the top wall section for increasing the capacity of the side wall sections to resist thrust from the top wall section. Vertically spaced and generally horizontal layers of soil reinforcement members or grids may be positioned within the soil backfilled adjacent the outer surfaces of the side wall sections, and precast concrete anchor members may be attached to the side wall sections above supporting footers for the side wall sections. Shims are used between the footers and the anchor members for temporarily positioning and aligning the side wall sections before receiving the top wall section.

The invention relates to an integrally-cast cement pervious concrete ecological protection slope and a construction method thereof. In the invention, a protected slope becomes an integral rigid structure by carrying out in-site casting on a slope required to be protected with macropore pervious cement concrete; an ecological mixing basic layer is slightly spraying on the surface of a pervious cement concrete protecting layer; seeds germinate, grow and can penetrate through a pervious cement concrete protection slope structural layer; and long root-system plants are selected and used to ensure that a pervious cement concrete protection slope is connected with a clay layer of a slope surface substrate together by root systems of vegetation covers. Compared with the prior art, the ecological slope obtained by construction in the invention has the advantages of stable structure, excellent ventilating performance and permeable performance, simpleness and quickness in construction, strong capabilities of water conservation and soil reinforcement, favorable protection effect of the vegetation covers and the like.

The invention discloses a soil consolidation method for realizing normal-pressure cabin opening of a shield machine. The method realizes the soil reinforcement by directly injecting mixed grout at a construction part by a shield machine, and solidifying the mixed grout to be plastic concretion with low intensity and small cohesive force on a construction face so as to finally realize normal-pressure cabin opening. The method can avoid the inconveniences caused by the soil reinforcement realized by constructing downwardly from ground or the soil reinforcement realized by injecting grout to form set cement with high intensity and large cohesive force, is favourable for the reduction of the construction cost effectively. The method is used in the field of engineering construction.

A reinforced soil retaining wall system (10) in which a plurality of blocks (12) are arranged in courses (14) to form a wall (16). Soil reinforcement is provided to the wall (16) using a plurality of lengths of strip reinforcement (18) inserted in and extending from the blocks (12), the strip reinforcement (18) being buried under compacted backfill (20) either as each course (14) is laid or after construction of the wall (16). Also disclosed is the use of a second plurality of sections of soil reinforcement, spaced apart from the first plurality of sections and arranged to extend perpendicular to the wall.

The invention discloses a basement supporting structure in a soft soil area. The basement supporting structure is characterized by being provided with two side slopes; concrete slabs are laid at the top of the first side slope and the top of the second side slope, a water stop curtain is arranged at the end of the outer side of the first side slope, a U-steel weir is arranged at the corner of the first side slope, a concrete tube is arranged on the outer side of the U-steel weir, a drainage pipe is arranged in the middle of the concrete tube, the gap between the drainage pipe and the concrete tube is filled with pebbles, a negative pressure well is arranged in the middle of the horizontal segment of the second side slope, a coping beam is arranged at the top of a slope protection pile, a first anchor rod is fixed to the coping beam through an anchor device, an embedded steel plate is buried in the coping beam, an upper inclined strut is welded to the embedded steel plate and fixed to angle steel after being tensioned by a jack, the angle steel is welded to a steel plate embedded in a concrete buttress, a second anchor rod is fixed to an intermediate beam through an anchor device, and a passive soil reinforcement area is arranged on the inner side of the slope protection pile. The basement supporting structure is low in construction cost and short in construction period.

The invention discloses an extruding and extending device for horizontal loading drainage solidifying soft soil reinforcement and a construction method thereof, and belongs to the technical field of civil engineering. The extruding and extending device is formed by connecting a plurality of extruding and extending device units, wherein each unit consists of a central screw, a central nut pair, supporting rod pairs, a supporting beam and a water-permeable filter membrane; the central screw is formed by connecting a forward screw and a reverse screw; a forward nut and a reverse nut in the central nut pair are sleeved on the forward screw and the reverse screw respectively; the forward and reverse nut pair is hinged with a plurality of supporting rod pairs; the other end of each supporting rod pair is hinged to the supporting beam; and the water-permeable filter membrane is coated outside the supporting beam. The central screw of the extruding and extending device in a contraction state in soil is rotated to make the forward nut and the reverse nut move in opposite directions, the supporting rod pairs push the supporting beam and the water-permeable filter membrane to extend and extrude a soil body, and water in the soil is discharged to the extruding and extending device through the water-permeable filter membrane, so that the soil body is solidified; and the water in extruding and extending holes is drained, and an appropriate material is injected, so that construction is finished. By the extruding and extending device and the construction method thereof, the soil body is quickly solidified, and settlement after construction is reduced.

The invention relates to a composite ecological intercepting padding material and a preparation method. The composite ecological intercepting padding material has an interception effect on nitrogen and phosphorus pollutants greatly increased due to urban storm flows and also has wave resistance and soil reinforcement effects on revetments for rivers and lakes. The padding material is prepared into a modularized revetment material with nitrogen and phosphorus absorption property and a large number of micro air spaces through the sintering method by using the nitrogen and phosphorus absorption function and the thermal stability of a special padding material. The padding material can restore a water body with a great change in load due to nitrogen and phosphorus pollution through the bio-contact degradation function and the absorption function, optimize and improve the water quality restoration function of the ecological revetment technology and solve the problem on placing and fixing the padding material in river and lake water bodies.

The invention discloses a method for solidification of a shallow ultra-soft ground by vacuum dewatering-drainage combined with magnesium oxide carbonization, and belongs to the technical field of treatment of silt and soft soil reinforcement in environmental geotechnical engineering. The method comprises the steps that vacuum dewatering-drainage treatment and magnesium oxide carbonization solidification treatment, specifically, initial exploration and pretreatment, vacuum dewatering-drainage system arrangement, secondary exploration and treatment, bedding sand evenly-mixing, curing agent evenly-mixing, ventilation system connection, carbonization and the like. According to the method, the water content of sludge is lowered through a physical treatment mode, then the dosage and incorporation ratio of a curing agent are determined according to physical indexes, the intensity of the sludge is quickly improved through a chemical curing method of magnesium oxide carbonization, the seepage-drainage functions in the physical treatment process and the ventilation function in the chemical curing process of a drainage plate and the bedding sand are fully developed through the method, the method has the characteristics of economy and environmental protection, short treatment period, good treatment effect and the like, and meanwhile, resource utilization of industrial slag, building wasteslag and carbon dioxide in soft ground treatment is achieved.

The invention discloses a terrace bank construction method for changing slope farmland into level terraces in the reservoir area of the Three Gorges. The slope farmland consists of a plurality of transversely-partitioned cultivation units; a terrace bank for soil reinforcement walking is built on the outer side of every cultivation unit; all terrace banks include stone banks and soil banks; the soil banks are always arranged between every two stone banks; the terrace bank on the outer side of the cultivation unit on the bottommost layer of a slope surface is a stone bank; every cultivation unit is cultivated by keeping the original slope farmland micro-topographic feature; and the soil banks are positioned on the outer edges of the original cultivation units. The method has the advantages of reduction in the cost investment, convenience for agricultural cultivation, good water and soil conservation effect and easy acceptance by farmers.

The invention relates to a vacuum pre-loading combined electric process test apparatus and a test method thereof, and belongs to the field of geotechnical engineering foundation treatment. The apparatus comprises a power supply part, a vacuum pump part and a box body part. The box body part is a transparent toughened glass box, soil in the box body is coated with a sand cushion, and the front side of the box body is provided with equidistant electric potential monitoring point hole sites. Cylindrical hollow graphite rods are inserted to two sides of the box body as a cathode and an anode, and the anode is a salt solution injection channel. A plastic water draining plate is inserted to a position close to the cathode, the top end of the water draining plate is positioned in the sand cushion and is connected with a conical flask through a rubber tube, and a vacuum pump is connected with the conical flask through the rubber tube. The invention also provides a method for carrying out vacuum pre-loading combined electric process test by using the apparatus. The apparatus can simulate vacuum pre-loading combined electric process soft soil reinforcement indoors, can guarantee test sealing and prevent electrode corrosion, and can be used to accurately measure the water draining effect, the settlement consolidating effect and the vacuum pre-loading combined electric process energy consumption ratio of soil.

The invention relates to the field of geotechnical engineering, and discloses a method for reinforcing a lignin fiber soil stabilizer roadbed. Specifically, the invention relates to a soil reinforcingcomposition, an improved soil containing the soil reinforcing composition, an application of the soil reinforcing composition and/or the improved soil in soil body improvement, and a method for soilbody improvement. Specifically, the soil reinforcing composition provided by the invention comprises a stabilizing component, a reinforcing component and lignin fibers, wherein the stabilizing component is at least one of cement, slag and lime and optional gypsum; the reinforcing component is water glass and/or silica fume. When the soil reinforcing composition provided by the invention is appliedto soil body improvement, the compression strength, crack resistance and water stability of the soil body can be obviously improved.

The invention discloses an ecological slope protection structure favorable for growth and reproduction of plants and a using method of the ecological slope protection structure. The ecological slope protection structure comprises protection components arranged on a slope in an arrayed manner. The protection components comprise seedling nursing pots. Hollow cylinders are arranged at the upper parts of the seedling nursing pots. Openings are formed in the tops of the hollow cylinders. The upper parts of the seedling nursing pots come out from the surface of the slope. Hollow cones are arranged at the lower parts of the seedling nursing pots. The lower parts of the seedling nursing pots are embedded in the slope. The upper parts and the lower parts of the seedling nursing pots are made integrally. Separating layers with holes are arranged between the upper parts and the lower parts in the slope surface direction. Early-stage growth of shrubs is prompted in the drought microenvironment of the slope, so that the shrubs exert the effects of soil reinforcement and slope protection effectively, the catchment time is prolonged, rainwater is stored, vegetational communities on the slope are established and restored, the conditions that the slope is easy to lose, the vegetation site conditions are bad are improved, the vegetation coverage is improved, and the stability of the slope is enhanced.

The invention discloses a method for the no-tillage plantation of grassland in a water-level-fluctuating zone. A well-shaped stem pressing method is used for planting herbaceous plants which can be reproduced by creeping stems; and according to the well-shaped stem pressing method, the base ends and top ends of every four detached creeping stems are pairwise crossed into a well shape, four cross points are formed, and are buried into soil, and at least one stem node part of each of the two creeping stems at each cross point is buried into the soil. Compared with the conventional pit planting method, the method is time-saving and labor-saving, the working efficiency is improved, and water and soil loss is reduced; at least two stem node parts of each seedling are buried into the soil, so that the rootage and survival capability of the seedling is improved, the lawn starting speed of the grassland is increased, and the coverage of 80 percent can be reached generally after the grassland is planted for four months; long creeping stems are used as seedlings, so that the using amount of the seedlings is decreased, and the utilization rate of the seedlings is increased; and the seedlings are uniformly arranged along four directions, so that the lawn formation uniformity of the grassland is improved, and soil reinforcement and slope protection effects are enhanced. Therefore, the method is applied to the lawn starting of the soil reinforcement and slope protection grassland in the water-level-fluctuating zone.

A system and method provides for repair/reconstruction of bridge and culvert constructions. Geosynthetically confined soils are used in combination with soil nails. The soil nails provide additional tensile strength below the areas reinforced with the geosynthetically confined soils. The soil nails may include both horizontal and vertical soil nails. Various forms of vertical tensioning support can be provided to include soil nails, micro-piles, sheet piling, and the like. The confined soils are installed at locations under and adjacent to the man made constructions, and can be provided in both symmetrical and asymmetrical configurations. For bridge constructions, the confined soils may be installed at a desired depth under the bridge girders, and under other primary support members of the bridge. Horizontal nails may be installed under and adjacent to the confined soils. According to the method, incremental excavation can take place so that the manmade construction being repaired may remain partially open to accommodate public travel or other intended uses, thereby limiting the impact of the repair/reconstruction effort.

The invention discloses a construction method for restraining frost heave and thaw settlement in cup-shaped horizontal freezing. The method concretely includes the first construction step of arrangement of pressure release holes and grouting holes, the second construction step of frost heave control and the third construction step of thaw settlement control. The method has the advantages that as two rows of the pressure release holes and grouting holes are formed in the positions above a cup-shaped horizontal freezing wall, influences of the frost heave and the thaw settlement in the process of horizontal freezing of the horizontal freezing on surrounding formations, buildings, traffics and underground pipelines can be effectively restrained; the settlement amount of the formations can be controlled within -8mm, and the ridging amount can be controlled within 5mm; on the premise of guaranteeing the bearing capacity and the waterproof performance of the formations, cement soil reinforcement is not needed in advance, so the use amount of cement is effectively reduced, and time, the manual cost and the material cost are greatly saved.

A microorganism negative-pressure surface soil reinforcement method comprises the steps that a, negative-pressure pipes 1 are buried at the position 10 cm to 20 cm below the surface of a to-be-reinforced soil body 4, the line spacing is 20 cm, and a negative-pressure pipe network is formed; b, microorganism bacterial liquid is sprayed to the surface of the to-be-reinforced soil body 4, meanwhile, a vacuum pump 3 is started to extract air and pore liquid in the to-be-reinforced soil body 4 through the negative-pressure pipes 1, infiltration of the microorganism bacterial liquid on the surface of the to-be-reinforced soil body 4 is accelerated, and when the bacterial liquid enters the negative-pressure pipes 1, the vacuum pump 3 is shut down, and standing is carried out for 4 h to 8 h; c, a pre-prepared gluing solution is sprayed to the surface of the to-be-reinforced soil body 4, then the vacuum pump 3 is started to extract air and pore liquid in the to-be-reinforced soil body 4 through the negative-pressure pipes 1, the to-be-reinforced soil body 4 around the negative-pressure pipes 1 is in an unsaturated state, and when the saturation degree is reduced to 25%, the vacuum pump 3 is shut down, and standing is carried out for 12 h; and d, the step b and the step c are repeated till the strength of the to-be-reinforced soil body meets the reinforcement requirement.

The invention is applicable to the technical field of pipeline repair, and provides an underground traction type trenchless pipeline repair method. Firstly, a baffle is installed in a first construction well at one side of a collapse position of a pipe body to seal an input pipeline for draining water to the first construction well, a guide block is placed in the pipe body from the first construction well, one end of the guide block is connected with one end of a hose, then the front end of the guide block is dragged to move to a second construction well, and the guide block is moved to the collapse position of the pipe body to support the collapse position, soil reinforcing slurry is filled in the soil layer around the collapse position, the soil reinforcing slurry is a polyurethane chemical grouting material, after the reinforcing slurry is solidified, the guide block is continuously dragged, the hose is put in the pipe body and completely covers the collapse position, the hose is made to adhere to and be solidified with the inner wall of the pipe body, so that the collapse position of the pipe body is sealed and repaired, the whole process does not need to excavate the ground, the influence on environment and traffic is small, and the service life of a pipeline can be prolonged.

The invention discloses a river and sea bottom steel jacking pipe butt joint construction method. The method includes: for soil in a butt joint region, on the basis of taking a simple reinforcement measure of high-pressure spiral jet grouting used in land and underground jacking pipe butt joint, assisting with double-liquid grouting water stoppage and leaking stoppage measures so as to realize soil reinforcement with the main purpose of water stoppage; arranging a first temporary steel-structure external formwork support water stopping ring; transporting a reelpipe to the butt joint region in a divisional manner prior to assembling and welding, and finally finishing large-diameter steel jacking pipe butt joint in the sea bottom environment. By the method, not only can the requirements on tool pipe butt joint under complicated and restricted conditions that steel jacking pipe butt joint positions are all located in extremely-soft sandy soil layers of the sea bottom and drift sand and water leakage are easily caused under the impact of tides be met, but also the requirement for shortening long-distance jacking pipe construction period can be met. The key water stoppage problem which needs to be solved in jacking pipe butt joint construction in the soft sandy soil layers of the sea bottom is solved, engineering cost and risk are low, and the method has broad market prospect.

The invention relates to a soil compaction assistant, in particular to a preparation method of the soil compaction assistant. The method includes the steps of: (1) using unsaturated amide, polyethylene polyamine and formaldehyde to prepare a polyamide polyamine copolymer under the action of an initiator; and (2) heating the prepared polyamide polyamine copolymer, waterborne epoxy resin, water soluble silicate, non-ionic cellulose ether, a polyethylene oxide (polypropylene oxide) ether defoaming agent and water, and stirring the materials evenly to obtain the soil compaction assistant. When the soil compaction assistant provided by the invention and a small amount of cement are co-doped in mucky soil, soil can solidify closely, the unconfined strength is greatly improved, contraction and expansion coefficients decrease, and the impermeability, frost resistance, and crack resistance of the soil are good. When the soil compaction assistant provided by the invention is applied to soft soil reinforcement, the construction is simple and is not affected by temperature, the work efficiency is high, the construction period can be greatly shortened, and the cost is reduced. Directed at different soil properties, the soil compaction assistant provided by the invention can be widely applied to water conservancy, channels and roads and other projects.

The invention discloses a base rock uplift region shielding tool-changing in-situ reinforcement method. The base rock uplift region shielding tool-changing in-situ reinforcement method comprises the steps that 1, micro-pile isolation region construction is performed, namely micro-piles are arranged around a cutter disc of a shield machine to form a rectangular isolation region, wherein the micro-piles of the rectangular isolation region are located in front and at back of the cutter disc of the shield machine and on the left side and the right side of the cutter disc of the shield machine respectively, the micro-piles located in front are 2 to 3 meters away from the cutter disc of the shield machine, the micro-piles located at the back are 3 to 4 meters away from the cutter disc of the shield machine, and the micro-piles located on the left side and the right side are 1.5 to 2 meters away from the cutter disc of the shield machine; 2, sleeve valve pipe grouting is conducted in the micro-pile isolation region. A curtain is formed around the cutter disc of the shield machine by adopting the micro-piles, the formed curtain is the rectangular isolation region formed by the micro-piles arranged around the cutter disc of the shield machine, and soil reinforcement is performed in the rectangular isolation region in the sleeve valve pipe grouting mode to effectively prevent the slurry leakage risk occurring in the grouting process, ensure effectiveness of grouting operation, avoid the influence on construction progress and reduce safety risk.

The invention discloses a reclamation area ultra-deep concrete diaphragm wall structure and a construction method thereof. The concrete diaphragm wall structure is in a ring shape, the concrete diaphragm wall structure comprises I type concrete diaphragm walls and II type concrete diaphragm walls which are arranged at intervals, the I type concrete diaphragm walls comprise I type groove sections,reinforcement cages arranged in the I type groove sections and cast-in-situ concrete, and the II type concrete diaphragm walls comprise II type groove sections, reinforcement cages arranged in the IItype groove sections and cast-in-situ concrete. Groove grasping technology construction can be conducted in advance, the construction main line time is not occupied, the construction efficiency is greatly improved, and the construction time is shortened. A reclamation area belongs to soft soil ground, soil reinforcement is conducted by using three-axis mixing before concrete diaphragm wall construction. Perpendicularity is well controlled, the width of sleeve connection is guaranteed, and later stage leakage is avoided. The formed concrete diaphragm wall structure is firm and durable, the safety level of a foundation pit support structure is the first level, and the importance factor is 1.1. The service life of the foundation pit temporary support structure is designed to be two years, andthe service life of the foundation pit support structure for permanent using is 50 years.

The invention discloses a method for reinforcing soil by using a soil solidification solution. The method for reinforcing the soil by using the soil solidification solution includes the steps of putting calcium carbonate powder in a high pressure resistant container, adding water and then continuously introducing carbon dioxide gas thereto to form a saturated aqueous solution of calcium bicarbonate under the action of stirring, continuously spraying or pouring the obtained aqueous solution of the calcium bicarbonate on the surface or inside of the soil, allowing the calcium bicarbonate to decompose and form amorphous calcium carbonate with cementation function when water infiltrates into the soil for migration, and cementing soil particles into a whole to improve engineering properties such as strength, water stability and durability of the soil and meet the needs of engineering construction. The method for reinforcing the soil by using the soil solidification solution has the advantage of being suitable for various fields such as rock and soil reinforcement, dam and soil structures for anti-seepage and plugging, sand liquefaction prevention, heavy metal pollution soil treatment, earth and stone brick heritage building restoration, and concrete crack repair.

The invention discloses an electric osmosis and cathode vacuumizing combined soft soil reinforcement device and method which are used for reinforcing a foundation with low bearing force. A steel pipe is adopted as a cathode, and a steel bar is adopted as an anode, so that pore water in soft soil moves towards the cathode under the action of an electric field, and soft soil near the anode is reinforced; after a jet pump is started, the jet pump generates vacuum in the cathode steel pipe, pore water near the cathode is sucked into the cathode steel pipe under vacuum action, and soft soil near the cathode is also reinforced, so that the problem that the reinforcement effect of the prior art is not uniform is solved. Meanwhile, a sand cushion layer and a sealing film do not need to be laid, the procedure is simpler, the construction process is simplified, the construction cost is reduced, the construction period is shortened, and good economic benefits are achieved.

The invention discloses an indoor stabilized soil stirring device, and belongs to the field of soft soil solidification devices. The indoor stabilized soil stirring device comprises a test box and a support. The support comprises stand columns and a transverse rod which are connected. The transverse rod is located above the test box and provided with a supporting table. A stirring shaft is arranged on the supporting table. A channel is arranged in the stirring shaft. The stirring shaft is connected with a motor in a transmission mode. The upper end of the stirring shaft is communicated with a slurry feed pipe, and the lower end of the stirring shaft extends into the test box. Slurry spray openings are formed in the lower end of the stirring shaft and communicated with the channel. Guide rails are arranged at the bottom of the test box. The test box can slide on the guide rails. Slide rails are arranged on the transverse rod. The supporting table can slide on the slide rails. Each stand column comprises a supporting column body and a hydraulic column body. The supporting column bodies are communicated with a hydraulic pump. The lower ends of the hydraulic column bodies extend into the supporting column bodies. By means of the indoor stabilized soil stirring device, undisturbed soil taken back outdoors can be reinforced on site, the on-site geological conditions are well simulated, and the soft soil reinforcement effect is improved.