50results about How to "Prevent piping" patented technology

The invention discloses a tunnel freezing consolidation and soil-accumulating watering shield arrival method, which comprises the following steps of: (1) consolidating a stratum of a tunnel arrival section by using a jet pile or a mixing pile; (2) stopping water for a stratum close to an opening of a receiving well by using a freezing method; (3) removing a retaining wall of a tunnel portal, and filling in the receiving well to obtain a mound; (4) injecting water into the receiving well to reach the designed height; and (5) making a shield machine tunnel to enter the receiving well structure to finish the whole receiving work. By the method, when tunnel portal concrete is removed, the integral stability of soil mass can be ensured, seepage damage caused by a fine sand stratum is prevented, muddy water pressure during tunneling of the shield machine can be balanced, and is prevented from breaking through the peripheral soil mass of the tunnel portal, and the shield arrival is carried out safely and smoothly.

The invention relates to supporting and construction method of a steel sheet pile under soft foundation of a high flow plastic deep layer, and belongs to the technical field of building construction.The supporting and construction method of the steel sheet pile under the soft foundation of the high flow plastic deep layer comprises the steps of construction preparation, construction of guiding purlins, injection of a steel sheet pile, excavation and water drainage, foundation trench interior construction and removing of the steel sheet pile. The supporting and construction method of the steelsheet pile under the soft foundation of the high flow plastic deep layer is simple and easy to implement during the construction process, is easy to popularize, and can effectively stop water and prevent piping, and almost all supporting and protecting facilities can be reused after being disassembled.

The invention relates to a revetment structure composed of plastic steel plate piles and concrete. The revetment structure comprises plastic steel plate piles and a concrete coping, wherein the plastic steel plate piles are connected through a connector having two mutually matched ends; the concrete coping is preformed and can be stably buckled with the upper ends of the plate piles. The revetment structure can be used for revetments of rivers or lakes, is safe and stable, high in construction speed, low in construction cost, environment-friendly and pollution-free, less in influence on the surrounding environment, and long in durability, can be further used for resisting the seepage of embankments and dike bodies of rivers and protecting dams.

The invention relates to a method for constructing liquified discarded soil in the construction of a subaqueous structure, which comprises the following steps: (1) manufacturing a structure with a bottom plate or a fence; (2) installing a vibrator or a high-pressure water or high-pressure gas spraying device at the lower part of the bottom plate or the fence of the structure; (3) generating vibration by the vibrator installed at the lower part of the bottom plate or the fence, or spraying out a high-pressure water column or gas by the high-pressure water or high-pressure gas spraying device and liquifying a soil layer within a sinkage range of the structure; and (4) installing a slurry discharge pipe on the bottom plate of the structure in a way of penetrating through the bottom plate, installing high-pressure gas spraying devices at the lower part and the middle part of the slurry discharge pipe, discharging slurry under the function of high-pressure gas sprayed by the high-pressure gas spraying devices and enabling the structure to continuously sink. The construction of constructing a large bridge foundation, a subaqueous tank body, a subaqueous bunker, a caisson of a gravity type wharf or a revetment, a sand filling or rubble tipping embankment of sea filling cofferdam engineering, a caisson or a rubble tipping embankment of a bulwark or a jetty and the like is safe, the cost is lowered, and the construction period is shortened.

The invention discloses a road landslide emergency and permanent retaining integrated structure and a construction method thereof. The road landslide emergency and permanent retaining integrated structure comprises an emergency retaining structure and a later reinforcing structure; the emergency retaining structure comprises a stone cage, a steel pipe pile antiskid key, an anchorage device, a steel bar inhaul cable, geogrid, filling soil, an emergency rush-repair pavement and a fabricated steel plate; and the later reinforcing structure comprises a gravity-type retaining wall, later filling soil and a later widening pavement. An early emergency retaining structure can be constructed rapidly to ensure vehicle passing in the shortest time; and a gravity-type retaining wall reinforcing emergency retaining structure can continue to be constructed directly in the later period under the situation of ensuring emergency vehicle passing, the permanent retaining structure can be formed without altering the early emergency retaining structure, and higher social benefits and economic benefits are achieved. The construction method is simple and easy to implement, and construction is fast.

The method for lowering seepage line of dam body by adopting "sand nail" guide filtration process includes the following steps: digging hole on the slope of foot of dam foundation of back slope of dam body, hole direction is parallel or roughly parallel to water level, diameter of hole is 70-90 mm and its depth is 2-6 m; filling or placing the material in which the water is easily penetrated intothe hole to form sand needle, then closing the hole mouth with mixed sand and stone material, restoring external form of dam slope, guiding the water in the dam body into hole mouth and discharging the water into exterior from dam body, distance between nails is 1-1.5m, the sand nails are arranged in single row or two rows mode.

The invention relates to a dam body water-retaining and water-blocking device for a water conservancy project, in particular to a flood protection water bag. The flood protection water bag comprises a water bag main body and a water bag skirt body. A water inlet/outlet is formed in the water bag main body. The water bag skirt body is connected to the lower side of the water bag main body. A skirt body falling bag is arranged at the lower end of the water bag skirt body. The two ends of the water bag main body and the left side and the right side of the water bag skirt body are provided with zippers. Multiple flood protection water bag units are connected through the zippers into a whole, embankment water seepage can be prevented by the water bag skirt body, piping is prevented, and the height of an embankment can be increased after the flood protection water bag main body is filled with water, so that the flood protection level is increased, and the flood protection function is achieved.

The invention discloses a water draining and pressure relieving structure capable of realizing anti-floating. The water draining and pressure relieving structure capable of realizing anti-floating comprises a well wall pipe and a slow expansion type hydro-expansive antipriming pipe. The slow expansion type hydro-expansive antipriming pipe is arranged outside the well wall pipe in a sleeving manner. A micro-expansionary fine aggregate concrete layer is arranged between the slow expansion type hydro-expansive antipriming pipe and the well wall pipe. The outer diameter of the slow expansion typehydro-expansive antipriming pipe corresponds to the inner diameter of a water draining hole in which the slow expansion type hydro-expansive antipriming pipe is located. The structure has the advantages that when water leaks out of the well wall pipe, both the slow expansion type hydro-expansive antipriming pipe and the micro-expansionary fine aggregate concrete layer expand, and at the moment, the gap between the slow expansion type hydro-expansive antipriming pipe and the inner side wall of the water draining hole decreases, so that the corrosion to a floor layer due to the outflow, from theexterior of a well wall to the floor layer, of the water under the floor layer can be effectively prevented, the strength of the floor layer is lowered and the function of anti-floating is realized;the water under the floor layer is drained out through the well wall pipe, so that the buoyancy which is applied to the floor layer by the water is reduced and the function of pressure relieving is realized.

The invention discloses a high-water-level complex geological area secant pile hard cutting pile forming construction method. The method comprises the steps that S1, pile position numbering is conducted; S2, plain concrete piles are constructed firstly, and more than three piles are constructed and separated; S3, after the first plain concrete pile and the third plain concrete pile reach 70% of the design strength, a second reinforced concrete pile is constructed, and more than three piles are constructed and separated; In the step S2 and the step S3, a drill rod of the rotary drilling rig iscylindrical, a plurality of vertical ribs which are evenly distributed in the circumferential direction are arranged on the outer wall of the drill rod, and all the ribs penetrate through the lower end of the outer wall of the drill rod. After the drill hole is drilled in place, reversing and retreating; the plain concrete piles and the hole wall, the reinforced concrete piles and the hole wall, and the plain concrete piles and the reinforced concrete piles are spirally meshed in a zigzag mode after pouring forming. The device is specially used for high-water-level complex geological areas tosolve the technical problem that holes cannot be formed due to high-water-level complex geology, and is efficient, rapid, safe and reliable, and the construction quality is guaranteed.

The invention discloses a double-layer water well pipe with a filtering structure. The double-layer water well pipe comprises a pipe body, wherein the pipe body consists of a water seeping outer pipeand a water seeping inner pipe which are coaxially sleeved together distantly; the pipe wall of the water seeping outer pipe is sleeved by a non-woven filter screen; the hole diameters of through holes uniformly formed in the pipe walls of the water seeping inner pipe and the water seeping outer pipe are not greater than 1mm; a small gravel and cobble layer and a medium and coarse sand layer are arranged in an annular space between the water seeping inner pipe and the water seeping outer pipe from inside to outside respectively; the small gravel and cobble layer and the medium and coarse sandlayer are arranged in coaxial cylindrical structures; the grain diameter of medium and coarse sand in the medium and coarse sand layer is 0.25-1.5mm; the grain diameter of small gravels and cobbles is1-4mm. After double-layer filtration, the water quality in a well meets irrigation requirements. The double-layer water well pipe is applied to irrigation by drilling the well for taking water in a fine sand stratum, can prevent fine sand from generating piping erosion and quicksand effects through coarse aggregate and makes water clear.

The invention relates to the technical field of pipe jacking, in particular to a construction method for the pipe jacking with sand layers. The construction method comprises the following steps that step one, according to the scheme for arranging holes, a grouting opening is formed by drilling of a drilling machine; step two, a phosphoric acid solution and glassy water are poured into the groutingopening synchronously; step three, after the phosphoric acid solution and the glassy water condense, the glassy water and cement paste are poured into the grouting opening synchronously; and step four, after the glassy water and the cement paste condense, pipelines are placed and the pipe jacking operation is carried out. Before the pipe jacking operation is carried out, two kinds of liquid are poured into the grouting opening before and after, the phosphoric acid solution and the glassy water of the step two condense by mixing, the glassy water and the cement paste of the step three condenseby mixing, and the double actions of the two play a good role in the consolidation of groundwater and quicksand and play a good role in reducing the sand layer disturbance during the subsequent pipejacking operation, and can effectively prevent settlement of surrounding road surface and buildings. Meanwhile, later pipe jacking operation is further facilitated, the construction efficiency is improved, and the gushing mud is not prone to appearing.

The invention relates to a sandy soil embankment construction method, and relates to the technical field of water conservancy engineering. The sandy soil embankment construction method includes the following steps that S1, foundation cleaning is conducted, specifically, debris and a soft soil layers on the original ground are cleared, and a dense soil layer is exposed; S2, filling is conducted, specifically, sandy soil is filled and compacted in layers and sections; S3, toe fixing is conducted, specifically, a gabion stone cage fixing toe is used for being arranged at the revetment bottom on the water corresponding side of an embankment body; S4, slope protection is conducted, specifically, non-woven fabrics, a sand gravel cushion and a Reno mattress are successively laid on a revetment onthe water corresponding side; and S5, a diaphragm wall is formed, specifically, a mixing drilling rig is used for forming interlocked mixing piles in the embankment body, the mixing piles are inserted into an embankment foundation, and the diaphragm wall for seepage prevention of the embankment body and the embankment foundation is formed by interlocking. According to the sandy soil embankment construction method, the ant-seepage and anti-impact properties of a reinforcing dam are effectively improved.