39results about How to "High pile strength" patented technology

A method for constructing pipe piles while drilling for building or bridge foundations. The construction steps are to cover high-strength prestressed concrete pipes or steel pipes with drill pipes on the ground first, and install impactors and reaming retractable drill bits at the front ends of the drill pipes. , Follow the pipe while drilling, follow the pipe retaining wall, drill to the design elevation, stop drilling, withdraw from the reaming to shrink the drill bit, use the mud pump to clean the mud and sediment, pour concrete into the pipe, and simultaneously inject pressure grout to the outside of the pipe wall , stop when concrete and grout reach the ground; the object of the invention is to propose a construction method with fast construction speed, reliable quality, less material consumption, high bearing capacity of piles, mechanized operation, and environmental protection. In the construction method of bored cast-in-place piles, the use of mud retaining walls pollutes the environment, the hole is easy to collapse during the drilling process, the quality of concrete pouring is unstable, and the prestressed pipe piles are easy to cause the soil to rise. The strength of the pile body constructed by the invention is high. , There is no sediment at the bottom of the pile, and the pile end is completely rock-socketed, which can reach more than 2 times the bearing capacity of the same diameter bored pile.

The invention provides a pile-forming method for a cement paste spraying multi-directional core entraining mixing pile, which is characterized in that (1) a mixing pile machine is in position and leveled, and a bit aims at a pile position; (2) a drill pipe downward stirs and cuts soil along a guide frame until the designed depth; (3) after the drill pipe reaches the predetermined design depth, concrete are locally and continuously sprayed and stirred at the tip of the pile for more than 10 to 30 seconds; (4) the drill pipe is lifted; (5) concrete spraying is carried out while stirring; the drill pipe is lifted to the surface of earth or the designed elevation to finish the construction of a signal multi-directional mixing pile; (6) the tip of the pile of a core pile passes through a central hole of a jacking pile platform and is inserted into the center of the finished multi-directional mixing pile; (7) after the core pile sinks by self-weight and is penetrated into a certain depth of the mixing pile, the core pile is collated along two directions and the verticality of the core pile is regulated; the core pile is continuously sunken without any unmistakable; and (8) the core pile is pressed by hydraulic static force until the designed appointed depth. The method can realize the synchronous implementation of the mixing pile and the core pile operation, has high working efficiency, convenient construction, and low construction noise; the stress of the pile body is more reasonable and the pile shaft has high strength.

The invention discloses a rock-socketed pipe pile foundation with a pile core by concrete pouring and a pile side by static pressure grouting and a construction method for the rock-socketed pipe pile foundation. The pipe pile foundation comprises a prestressed concrete pipe pile, a pile shoe, concrete for pouring the pile core and cement mortar formed during static pressure grouting of the pipe side, and the pile shoe is connected with a lower end of a section of a pipe pile at the downmost of the pipe pile foundation. Before pouring the concrete for pouring the pile core, clean water is jetted by high-pressure jet grouting equipment to clean an inner wall of the pipe pile and rock-soil dregs retained in the pile core to be pumped out by a mortar pump. The cement mortar formed during static pressure grouting of the pipe side is formed by using a drilling machine to drill a plurality of holes close to the periphery of the pipe pile to a pile bottom and respectively statically pouring cement paste when the pipe pile is constructed to a designed elevation and the pile core is poured with underwater concrete for a certain time. The rock-socketed pipe pile foundation with the pile core by concrete pouring and the pile side by static pressure grouting and the construction method for the rock-socketed pipe pile foundation are especially suitable for rock-socketed pipe pile foundations, can increase force bearing area of a section of the pipe pile, and improve pipe pile strength and bearing capability of the pipe pile foundation, and the construction method is simple and reliable.

The foundation reinforcing method for loose and soft soil includes depositing straight sunken tube into loose and soft soil through vibration or other process, throwing stuffing, such as sand and stone, mine refuse, clay, etc. mixed with cement and water, into the sunken tube, hammering to density and form piles, and final spreading stuffing cushion in the top of the piles to form composite foundation with high strength cement piles. The method is simple in construction and low in cost, and has wide application range and no environmental pollution.

The invention relates to a high-strength triangular plum-blossom-shaped cement soil mixing bearing pile and a forming method thereof. The high-strength triangular plum-blossom-shaped cement soil mixing bearing pile is good in perpendicularity, incline resisting capability and full in full-load bearing capacity. The cement soil mixing pile comprises a cement soil mixing pile, two end faces and a cement soil mixing pile body are formed by connection of three plum-blossom-shaped petals, and one or more concrete cement piles are positioned in a high-strength triangular plum-blossom-shaped cement soil mixing bearing pile body. The high-strength triangular plum-blossom-shaped cement soil mixing bearing pile has the advantages that a pile foundation of the triangularly distributed plum-blossom-shaped cement soil mixing pile is large in bearing capacity, bearing and supporting points are triangularly distributed, and the pile foundation is good in stability; when the pile foundation formed by the triangular plum-blossom-shaped petals is positioned in a soft soil foundation, the three plum-blossom-shaped petals identical in inclined angles act on a wall of the soft soil foundation like three projected ejection posts, so that the cement soil pile is ensured not to incline but perpendicularly stand in the soft soil foundation; due to the fact that a three-axis drilling rod sinks along a guiding frame, stirs and sprays cement paste at the same time, and the sinking direction and the stirring direction are opposite, so that the cement paste and soil can be fully mixed integrally, and high strength of the cement soil pile is ensured.

The invention discloses a construction method of an ultrahigh bearing capacity stiff composite pile. According to the method, a cement soil peripheral pile is firstly constructed, and then, an inner core pile is constructed and driven in the peripheral pile. The construction method is characterized in that when the peripheral pile is constructed, a cement stirring device with blades in holoaxial arrangement is adopted for the cement stirring, and the simultaneous stirring is carried out in the whole pile length range; the cement stirring device with blades in holoaxial arrangement comprises a stirring shaft, the stirring shaft is connected with a power head, and a layer of stirring blades is arranged every 20 to 50cm in positions below the power head of the stirring shaft; a plurality of spray pipes are arranged in an inner cavity of the stirring shaft and are used for spraying water, dry powder, sand or curing agents, and spray openings of the plurality of spray pipes are positioned at the bottom of the stirring shaft; during the construction, the materials are sprayed through the spray pipes and are stirred for forming the pile. The construction method has the advantages that the construction efficiency is high, the intensity of the pile formed through construction is high, the bearing force is great, the bearing pressure of a pile body is more than 8000KN, the horizontal bearing force is more than 300KN, and the pulling resistant bearing force is more than 2000KN.

The invention discloses a construction device and construction method for a deep or ultra-deep rock-embedded precast pile and relates to the technical field of precast pile construction. The construction device comprises a full cylinder drilling machine, a non-polished cylinder or a plum-blossom-shaped cylinder, a drill rod, a drill bit and a grout spraying nozzle. The full cylinder drilling machine is connected with the non-polished cylinder or the plum-blossom-shaped cylinder and the drill rod. The drill rod is connected with the drill bit. The drill bit is connected with the grout spraying nozzle. The construction technique used for the deep or ultra-deep precast pile in soft soil areas can also be used for construction of a deep or ultra-deep rock-embedded precast pile comprising a slightly-weathered, moderately-weathered or hard underlying stratum foundation, soil sampling is not needed in the construction process, the construction speed is high, hole collapse and hole shrinkage are avoided, slag in holes does not need to be removed, the side form resistance of a soil body and the end resistance of bed rocks can be brought into full play, the pile body strength of the precast pile is improved, and the bearing capacity of a single pile is improved substantially; meanwhile, the construction speed of a finished pile can be increased substantially, industrial production is facilitated, and the construction cost is reduced; and furthermore, deep, ultra-deep or rock-embedded cast-in-place piles in the soft soil areas can be replaced to a certain extent.

The invention discloses a collapsible loess area highway reinforced bridgehead roadbed and a construction method. The roadbed sequentially comprises a sand-doped lime-soil pile composite foundation, areinforced sand-doped lime-soil mattress layer, a reinforced sand-stone-ash-doped improved loess backfill layer, a composite geomembrane, a graded broken stone hardcore and a bridgehead approach slabfrom bottom to top. According to the sand-doped lime-soil pile composite foundation, sand-doped lime soil serves as a pile body material to be filled into pile holes in a layered mode. The reinforcedsand-doped lime-soil mattress layer is formed by mixing river sand, lime and loess in proportion to form a filler; bidirectional geogrids are evenly laid at the vertical interval of 0.2 m for reinforcement, the reinforced sand-gravel-ash-doped improved loess backfill layer is formed by mixing river sand, lime and loess in proportion to form filler, and bidirectional geogrids are evenly laid at the vertical interval of 0.6 m in the filling process. The bridgehead roadbed is high in compression resistance, tensile strength, shearing strength and stability, the problem of 'bridgehead bump' caused by differential settlement and deformation of the bridgehead roadbed can be eliminated to the maximum extent, and meanwhile, the water stability and the frost resistance of the bridgehead roadbed are enhanced.

The invention relates to a novel self-balancing load box, in particular to an integrated load box which provides load application force during static load test pile detection and reinforces an engineering pile after a detection test is finished, and belongs to the field of civil engineering. A load box integrating test force application and engineering pile reinforcement comprises a connecting base, hydraulic pipes and a jack structure, wherein a connecting plate comprises an upper base and a lower base which are oppositely arranged; the jack structure is arranged between the upper base and the lower base to move; there are a plurality of hydraulic pipes, and one hydraulic pipe communicates with an liquid inlet and an liquid inlet device to form a loading liquid path passage, another hydraulic pipe communicates with an liquid outlet and an slurry inlet device to form a grouting liquid path passage, and other hydraulic pipes communicates with the liquid inlets and liquid outlets adjacent the jack structure. The invention has the following advantages: firstly, the effectiveness of grouting in a cylinder is improved; secondly, the compactness of the grouting in the cylinder can be ensured; thirdly, the filling rate of the grouting in the displacement clearance of the upper and lower section piles are ensured; fourthly, the pile body strength of the pile foundation is improved, andthe foundation pile reinforcing effect is achieved; and finally, the vertical bearing capacity of the foundation pile can be continuously transmitted.

The invention relates to a triangular plum-blossom-shaped cement soil mixing pile and a forming method thereof. The plum-blossom-shaped cement soil mixing pile is good in perpendicularity, incline resisting capability and full in full-load bearing capacity. The cement soil mixing pile comprises a cement soil mixing pile, and two end faces and a cement soil mixing pile body are formed by connection of three plum-blossom-shaped petals. The plum-blossom-shaped cement soil mixing pile has the advantages that a pile foundation distributed in multiple angles is large in bearing capacity, bearing and supporting points are triangularly distributed, and the pile foundation is good in stability; when the pile foundation formed by the plum-blossom-shaped petals is positioned in a soft soil foundation, a plurality of plum-blossom-shaped petals identical in inclined angles act on a wall of the soft soil foundation like three projected ejection posts, so that the cement soil pile is ensured not to incline but perpendicularly stand in the soft soil foundation; due to the fact that a multiple-axis drilling rod sinks along a guiding frame, stirs and sprays cement paste at the same time, and the sinking direction and the stirring direction are opposite, so that the cement paste and soil can be fully mixed integrally, and high strength of the cement soil pile is ensured.

The invention relates to a load box gap reinforcing device after self-balancing detection and a reinforcing method thereof, and belongs to the technical field of building foundation piles. The load box gap reinforcing device after self-balancing detection comprises a load box device, an upper displacement pipe, lower displacement pipes and a grouting annular loop pipe. The load box device comprises a grouting load box, a grouting one-way valve and a hydraulic pipe; the grouting annular loop pipe is fixed to the center of an upper plate of the grouting load box through indirect welding. The center line of the grouting annular loop pipe is coaxial with the center of the grouting load box, the diameter of the grouting annular loop pipe is the same as that of a middle hole of the grouting loadbox, two ends of the grouting annular loop pipe are connected with lower displacement pipes symmetrically arranged on two sides of the grouting load box respectively to form an annular channel, and the grouting one-way valve and the hydraulic pipe are symmetrically installed on two sides of the grouting annular loop pipe respectively.

The invention discloses a cement production and preparation method. Raw materials include 50-100 parts of silicate cement, 60-120 parts of coal ash, 40-80 parts of fine sand, 20-40 parts of graphite powder, 1-7 parts of polyvinyl alcohol fiber, 0.5-2 parts of water reducer, 0.1-0.2 part of additive and 20-40 parts of gypsum powder; calculated by volume fraction, the graphite powder accounts for 5-15% of total volume of the raw materials, and the polyvinyl alcohol fiber accounts for 1-2% of the total volume of the raw materials; the additive is composed of 5-10 parts of nano silicon dioxide, 15-20 parts of triethanolamine, 10-15 parts of water glass, 10-15 parts of dispersant, 5-8 parts of calcium carbonate, 1-1.5 parts of excitant and water. Cement has higher tensile strength and high tenacity, is suitable for damage restoring and reinforcing of structural tensioned parts and structure paving layers having high requirements on ductility and has special solidification enhancing effect on improving pile forming performance of engineering of organic matter soil, peat soil and pond-river sludge.

The invention relates to a foundation pit supporting construction technology combining an equal-thickness cement-soil diaphragm wall and tubular piles. The foundation pit supporting construction technology is characterized in that according to the technological process, a plurality of supporting structures are manufactured along the side boundary of a foundation pit and connected end to end to form a whole surrounding the foundation pit, wherein the specific construction technology of each supporting structure comprises the steps that a, after pile position surveying and setting out are carried out, drilling down is carried out, and cutting is carried out downwards till cutting is carried out at the preset depth; b, after cutting is carried out downwards at the preset depth, transverse cutting is started, and meanwhile grouting is carried out to form the equal-thickness cement-soil diaphragm wall; c, after transverse cutting is carried out for a certain distance, transverse cutting and grouting continue to be kept, and the prefabricated tubular piles are sequentially and vertically lowered into the diaphragm wall in the length direction of the diaphragm wall; and d, a top beam is poured to completely cover the prefabricated tubular piles and the diaphragm wall. The supporting structures with high integrality are formed, and construction speed is high.

The invention discloses concrete for precasting a magnesium oxide carbonized pile and application thereof, belonging to the field of building materials. Through improving a raw material ratio, namelythe ratio of powder obtained by mixing magnesium oxide and coal ash in the raw materials, a novel concrete formula for the precast pile is obtained. A precasting method includes 1) assembling a steelbar cage; 2) cleaning a mold and coating the inner wall of the mold with a layer of engine oil before mold filling; 3) paving concrete on the bottom of the mold, putting the steel bar cage into the mold to vibrate for compaction, uniformly pouring and feeding, and then performing segmented pouring and vibrating for compaction; 4) curing a molded semi-finished product pile in a carbonization case for 24 h, and then demolding to obtain the magnesium oxide carbonized pile. The pile is good in quality stability and cheap, the production cost is easy to control, and the pile has adequate carrying capacity, small transport and pouring amounts, and reduced material and energy consumption.

The invention discloses a preparation method of a pre-tensioning method prestressed centrifugal concrete solid square pile, which comprises the following steps: preparing a mold, and brushing a parting agent on the mold; mounting a reinforcement cage in the mold, and arranging a tensioning end plate; feeding prepared concrete into the mold; conducting prestressed tensioning on the reinforcement cage according to the designed tensioning stress, and then carrying out locking and anchoring; putting the mold which is fed with the concrete on a centrifugal machine for centrifugal forming treatment; after centrifugation is completed, forming a central hollow core in the center of the square pile, and pouring out residual slurry separated from the concrete completely; conducting secondary filling on the center of the pile through high-strength-grade concrete, filling the center hollow core through secondary material pumping, and forming the square pile; performing steam curing on the formed solid square pile; and releasing and demolding the cured solid square pile. According to the method, the strength of the pile body of the solid square pile is high, and the phenomena that the four corners of the solid square pile in a non-centrifugal production process fall off and are unfilled and the strength difference of the upper section and the lower section of the pile body is large due to concrete vibration are avoided.