64results about How to "Improve the bearing capacity of single pile" patented technology

The invention discloses a microorganism soil-reinforcement cement fly-ash gravel (CFG) pile composite foundation and a construction method. The construction method comprises the steps that a, a pile pipe is pressed into a foundation; b, microorganism bacterium liquid is injected into the pile pipe at the same time, and the microorganism bacterium liquid is made to diffuse towards the foundation around the pile pipe; c, the microorganism bacterium liquid is pumped out, and a cementing solution is injected into the pile pipe and made to diffuse to the foundation around the pile pipe and reacts with the microorganism bacterium liquid to generate calcium carbonate crystals, and incompact sandy soil or floury soil is cemented; d, the step b and the step c are executed repeatedly till the soil around the pile pipe meets the reinforcement requirement; e, pipe-drawing pile formation is conducted while cement-ash stabilized aggregates are poured; and f, a bed course is laid, so that the CFG pile composite foundation is formed. According to the microorganism soil-reinforcement CFG pile, the soil around the pile pipe is reinforced through calcium carbonate generated through reaction between the microorganism bacterium liquid and the cementing solution, so that the strength of the soil around the pile pipe is improved, and the quality problems of necking, pile breakage, soil carrying and the like in the pile forming process are solved; in addition, a reinforced soil body can be combined with a pile for bearing, and the bearing capacity of the single pile is effectively improved.

The invention discloses a bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation construction method for processing a small-area/narrow-range deep mucky soil or soft clay foundation, which is characterized in that: by utilizing the high bearing capacity and pile-bottom concrete reinforced and enlarged ends of bottom-grouting-enlarged small-diameter prestressed tubular piles, the bottom-grouting-enlarged small-diameter prestressed tubular piles effectively reduce diameters of pile bodies of the conventional prestressed tubular piles, reduce the buried depths of the pile bodies, and are arranged in a plane at a proper pile spacing to achieve micro shallow and dense pile group effect and achieve shallow soft field soil composite foundation reinforcement effect. The method has the advantages that: on bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation, the small-diameter prestressed tubular piles are used to compact the surrounding soil to transfer load, and grouting and reinforcement of pile bottoms are performed to improve the end bearing capacity, so that a shallow pile-based composite foundation is formed. Compared with a normal large-area soft soil foundation composite foundation processing method and a prestressed tubular pile foundation method, the method has the characteristics of simple process, high construction speed, miniature construction equipment, material saving and low cost.

The invention discloses a big-end expansion composite pile construction method. The hole enlarging big end pile squeezes earth body to form annular pile hole around the core pile in pile sinking. Before it closes, the filling is topping up by filling guide tube to form loop type outer pack pile. The big end pile is enlarged hole to increase end bearing of core pile. The outer pack pile can increase its lateral friction resistance to increase bearing. The construction is convenient. And the pile forming quality is reliable. The composite pile can greatly increase bearing, and reduce cost. It can be applied to various constructions of drawing resistant, loading pile foundation, composite foundation, deep foundation pit supporting and anti-seep.

The invention discloses a steel pipe pile. A plurality of paths of stiffened steel plates are welded on the surface outside the wall of the steel pipe pile along the axial direction and are arranged on the periphery outside the wall of the steel pipe pile at equal distance. The invention provides the steel pipe pile with simple structure and lower cost. By using the invention, under the condition without increasing the pipe length and the diameter, the bearing capacity of a single pipe is improved, the production and the pile driving of the steel pipe pile cannot be influenced and the increment of materials is extremely limited.

The invention discloses a strengthening soft clay foundation for draining pine piles and a construction method of the strengthening soft clay foundation. A plurality of rows of draining pine piles are pressed into the soft clay foundation. Pine piles are used as core materials of the draining pine piles. Geofabric or geotextile is used for wrapping and serves as a draining structural layer. A horizontal draining sand cushion is arranged on the surface of the soft clay foundation. According to the strengthening soft clay foundation for the draining pine piles and the construction method of the strengthening soft clay foundation, the draining pine piles integrate the draining function and the strengthening function, are particularly suitable for strengthening processing of soft clay foundations of small and medium-sized hydraulic structures and are also suitable for primary strengthening processing of super-soft dredger fill and peat soil foundations, and the draining pine piles can be pulled out to be repeatedly used according to processing timeliness.

The invention provides a rock-socketed hollow precast pile and a rock-socketed construction method using the precast pile. The precast pile comprises a hollow pile body and a rock-socketed pile tip. The rock-socketed pile tip comprises a steel pipe pile joint section and a big-end-up circular-truncated-cone-shaped pile tip prefabricated by concrete, the steel pipe pile joint section comprises a thin-wall steel pipe, core filling concrete filled in the thin-wall steel pipe and a plurality of stiffening plates welded to the outer wall of the thin-wall steel pipe, and the core filling concrete and the circular-truncated-cone-shaped pile tip are integrally formed in a pouring mode. When rock-socketed construction is carried out, firstly, pile sinking equipment is adopted for sinking a precastpile till drilling footage is difficult, then, a rock core drilling machine is adopted for drilling or crushing plain concrete filling cores at the pile tip part and a hard soil layer and a rock stratum below the pile tip part from the hollow part of a pile body of the hollow precast pile to the designed pile bottom elevation, and a rock-socketed section pile hole is formed; and finally, the forcetransmission framework is put in, cementing materials are injected, and construction of the hollow precast rock-socketed pile is completed.

The invention discloses a pile and soil concreted and integrated composite pile and a construction method thereof. The pile and soil concreted and integrated composite pile comprises a peripheral compact soil layer. The compact soil layer is filled with in-site soil and a granular material and curing agent concreted body. The concreted body is integrally provided with a reinforced concrete pile, wherein the reinforced concrete pile and the concreted body are concreted into a whole. According to the pile and soil concreted and integrated composite pile and the construction method thereof, a frequently-used flexible granular material pile, a semi-rigid cemented soil pile, a rigid high-strength concrete pile are constructed in a compositing manner, the composite pile with the complementary strengthening and synergetic bearing functions is formed, the defect of a single pile method is overcome, and the beneficial effects of the single pile method are maintained, quality is reliable, construction is easy and convenient, manufacturing cost is low, the strength, rigidity and density are high, and the pile body size is large, so that the single-pile bearing capacity of the composite pile is high, meanwhile the weak state of soil among piles is improved greatly, and pile and soil bearing capacity distribution and pile body stress distribution are optimized; and the pile and soil concreted and integrated composite pile can be used as a vertical reinforcement body in a composite foundation as well as a single rigid pile with the compression resistance, pulling resistance, leveling resistance and corrosion resistance functions, can be used for foundation pit supporting and diaphragm wall engineering and has the wide application prospects.

The invention discloses a pile mould for a PCC pile and a construction method for an overlong PCC pile. The pile mould consists of a feeding section, one or more segments of intermediate sections and a pile tip section which are connected sequentially; the connection among the sections can be disassembled; and inner pipes of the sections at connecting ends are longer than outer pipes, the inner pipes are connected directly at a connecting position, and the outer pipes are connected by outer pipe connecting sections. The construction method for the overlong PCC pile comprises the following steps: firstly, sinking the pile tip section of the pile mould in foundation soil, and then sinking one or more segments of intermediate sections in the foundation soil until the sunk pile mould reaches a designed pile length; and after concrete is poured, pulling out the pile mould in a subsection mode. The construction method overcomes the restriction to the length of the PCC pile, and the pile length of the PCC pile for construction is increased greatly through the connection of the pile mould of each section so as to implement the construction of the overlong PCC pile. The pile mould can adapt to requirements of different pile lengths due to the detachable pile mould, and is convenient to transport; and the sections of the pile mould are simple in connection and convenient in operation.

The present invention provides a double consolidated foundation treatment method using construction waste aggregate. The double consolidated foundation treatment method using construction waste aggregate comprises the following steps: a. pre-setting a number of pile points on the surface of the foundation, and placing the aggregate into the aquifer or the permeable layer at the lower part of the aquifer through a immersed tube at a plurality of pile points to form a plurality of vertical drainage bodies; b. compacting a plurality of vertical drainage bodies through the way of tamping, and forming a wedge-shaped drainage pile body with wide-top and narrow-bottom or big-top and small-bottom respectively, thereby compacting the periphery soil body by the lateral expansion process of the drainage body forming the wedge-shaped structure, and forming a dense pile-to-pile soil body, at the same time, the water contained in the soil is squeezed to both sides of the wedge-shaped drainage pile body and squeezed into the adjacent vertical drainage body, the pore water is discharged from the soil through the vertical drainage body by the compressive stress of the soil. According to the doubleconsolidated foundation treatment method using construction waste aggregate, the water content of the soil can be greatly reduced in the soft soil with large water content, so as to achieve the characteristics of high bearing capacity, short construction period and low cost. The invention further provides a composite foundation.

The invention discloses a high-polymer gravel permeable rigid pile and its construction technique. The construction technique includes steps of stirring certain graded gravel grains with a high-molecular polymer at a certain ratio according to the design requirement; after stirring evenly, pouring in a pile hole; gluing the gravel grains to be a whole body by means of the high-molecular polymer.;through proper compaction and vibration, forming a rigid pile while reserving a part of gap between the gravel grains; forming a vesicular structure and arranging reverse filter layers at the outsideand the bottom part of the pile body. The high-polymer gravel permeable rigid pile is simple in construction technique, controllable in quality, short in construction term and low in cost.

The invention provides a method for jacking rectification of a building. The method includes the following steps that S1, a newly added bearing platform is arranged, the newly added bearing platform reserves a pile pressing hole; S2, the newly added bearing platform is reliably connected with an original bearing platform; S3, an anchor rod static pressure pile is constructed in the pile pressing hole; S4, the newly added platform and the original bearing platform are supported by a jacking system and the anchor rod static pressure pile; S5, an original pile of the original bearing platform iscut off; S6, the newly added platform and the original bearing platform are jacked by the jacking system; S7, a gap below the newly added platform and the original bearing platform is fully filled; and S8, the pile pressing hole is sealed. According to the method for jacking rectification of the building, the damage to the building caused by jacking is reduced, damage to an original structure of the building is not required, and the safety is relatively high.

The invention discloses a vertical cement mixing pile forming device and a forming construction method. The forming device comprises a vertical driving rod, a driving device, a vertical outer sleeve sleeving the outer side of the vertical driving rod and a mixing device installed on the lower portion of the vertical driving rod. The outer sleeve is connected with a cement paste pumping device. The mixing device comprises two horizontal driving rods and two groups of mixing impellers which are symmetrically arranged and perform vertical mixing synchronously. The forming construction method comprises a first step of construction preparation, a second step of cement mixing pile construction: a step 201 of drill-down mixing and spouting; a step 202 of lifting mixing and spouting; and a step 203 of pile body forming. The vertical cement mixing pile forming device is reasonable in design, simple and convenient to construct and good in using effect; in the cement mixing pile forming process, the vertical cement mixing pile forming device is favorable for drill-down mixing feeding of a vertical cement mixing pile device, the section of a pile body of a formed cement mixing pile is rectangular, the construction is simple and convenient, and the single cement mixing pile formed by construction has higher bearing capacity.

The invention particularly relates to a construction method of a prestressed pipe pile with vertical water discharge grooves, and is used for solving the problems in the traditional construction of the prestressed pipe pile, such as sedimentation, bearing capability reduction and pollution to the construction field. The construction method comprises the following steps of a. uniformly distributing water discharge grooves on external circumference of the prestressed pipe pile, and arranging a V-shaped groove between two adjacent water discharge grooves, wherein the V-shaped groove is communicated with the two adjacent water discharge grooves; b. installing a water accumulation protection drum with an opening at the bottom at the insertion position of the prestressed pipe pile, wherein a water guide pipe communicated with the water accumulation protection drum is arranged on sidewall of the water accumulation protection drum and a control valve is arranged on the water guide pipe; c. inserting the prestressed pipe pile along the opening of the water accumulation protection drum, wherein pore water enters the water discharge grooves under the action of pressure, the pore water in the water discharge grooves rises and is discharged through the water guide pipe; and d. installing the water accumulation protection drum to the insertion position of next prestressed pipe pile. The construction method has reasonable and reliable structure design, not only can reduce insertion resistance to improve construction progress rate, but also has good effect of inhibiting sedimentation after construction, and has the advantages of simpleness in structure and easiness in implementation and control.

The invention relates to the field of building construction, in particular to a construction method used for punching-typed large-diameter steel pipe hole-forming pouring piles, comprising the steps as follows: step 1: hole forming: the large steel pipe with the external diameter of 800-2000mm is adopted for hole-forming; step 2: reinforced cages-arranging: the reinforced cages are arranged inside the large steel pipes; step 3: pouring: concrete is poured into the hole of the reinforced cage after the installation is complete, simultaneously, the hole-forming large steel pipe is pulled out and the pile is formed. The pouring pipe construction method of the invention can replace the construction of manpower excavating pile and the mechanical hole-forming slurry wall-protection pouring pipe with large diameter, and has the obvious advantages of safe structure, greatly improving the bearing capability of single pile, environmental protection in-situ, safe construction, reducing the construction links and saving the engineering cost, etc., compared with the traditional mechanical boring pouring and manpower excavation pouring pipes.