81results about How to "Shorten pile length" patented technology

The invention discloses a construction method for a collapsible loess foundation. The construction method comprises the following steps of: firstly, performing foundation treatment on a loess field with collapsibility by using a super downhole dynamic consolidation (SDDC) pile; secondly, collecting undisturbed soil on site, normally performing an indoor experiment to measure an inter-pile soil compaction coefficient and an SDDC pile body compaction coefficient, evaluating the collapsibility, and if any one of the three indexes cannot meet a design requirement, performing pile compensation construction on the SDDC pile until the design requirement is met; and finally, pouring the pile and mudjacking. The method has the advantages of economy, environment friendliness, high treatment depth, good treatment effect, large bearing potential, high complicated load resistance and the like. By application of the method, various side effects caused by the collapsibility of the deep collapsible loess field can be eliminated, and requirements of upper-part high rise buildings on the bearing capability and settlement of the foundation can be met.

The invention discloses an ultra-deep T-shaped trench-wall pile in a soft-toped hard-bottomed soil layer and a trench forming method. The trench forming method includes the steps: firstly, pre-reinforcing soft soil at each external corner of a T-shaped trench wall; secondly, digging a guide wall foundation pit, treating the extremely soft soil layer at the bottom area of a guide wall to lead the bearing capacity of the foundation bottom of the guide wall to be larger than or equal to 100kPa; and thirdly using the trench forming way of 'drilling and gripping'. By the method, trench forming efficiency can be improved greatly, cost is lowered, and evident economy is achieved.

The invention relates to a self-supporting construction method for a multilayer underground structure next to an existing building. When the distance between a proposed underground building and the existing building is within 15 meters, the construction method is adopted, and the method specifically comprises the following operation steps: 1, supporting pile construction; 2, developing and controlling an earthwork of a negative first layer; 3, controlling holes at a frame column position and setting a retaining wall; 4, carrying out the construction of frame columns of a negative second layer; 5, carrying out the construction of top beams and plates of the negative second layer and columns, beams and plates of the negative first layer; 6, mounting horizontal steel supports; 7, developing and digging the earthwork of the negative second layer; and 8, carrying out the construction of other structures of bottom plates, walls and the like of the negative second layer according to a conventional method. The method skillfully uses the rigidity of an underground engineering structure self to provide a supporting point for the supporting pile so that the supporting pile is changed into a three-span indeterminate member from a cantilever member, so the bending moment load effect of the supporting pile is greatly reduced, then the designed pile length and section area of the supporting pile can be greatly reduced, the construction cost is saved by about over 35 percent, and the integral construction progress of the underground structural engineering is accelerated.

The invention discloses a self-balancing sinking large-diameter tubular pile and a construction method thereof. A tubular pile body comprises at least two sections of tubular piles, the diameter of the tubular pile body is phi3 to phi5 meters, a relay chamber is arranged between the upper and lower adjacent two sections of tubular piles, a group of relay jacks are arranged uniformly in the relay chamber at intervals, a base of the relay jack is arranged on the lower end face of the upper tubular pile, a telescopic rod of the relay jack is propped against the upper end face of the lower tubular pile, reserved pore canals are staggered in the tubular pile body between the adjacent two relay jacks at intervals, a pull rod passes through each reserved pore canal, the tubular piles are connected linearly by a group of pull rods, the lower end part of each pull rod is connected with an anchoring element on the lower end face of the lowest tubular pile, and the upper end part of each pull rod is provided with a through jack on the upper end face of the uppermost tubular pile. The relay chamber and the reserved pore canals are closed by concrete after the tubular pile reaches the bottom and the relay jacks are taken out. An external force such as hammering, strong vibration and the like does not need to work in the construction, so the construction cost is reduced, and the efficiency is improved.

The invention discloses a construction method for a cast-in-place pile through punching and base expanding and a base expanding device. The method includes the steps of 1) punching which includes reserving the pile position and pressing a protection drum into soil by utilizing hydraulic pressure; 2) base expanding which includes connecting a drill rod and the base expanding device and placing the drill rod and the base expanding device into the protection drum; 3) pile end construction which includes pouring a hard bulk material into a hole, utilizing a heavy punch to conduct tamping repeatedly till the material is compacted and pressing a conical pile head into the pile end through the heavy punch; 4) pile body construction which includes that a connection pipe is connected with the drill rod through threads, the connection pipe is welded with a first rod piece, two ends of the first rod piece are connected with a second rod piece through bolts, the second rod piece is arranged in a guide groove through a bolt, the first rod piece is fixed on the second rod piece through a bolt, a baffle is arranged on the connection rod, the connection rod is connected with the bolts, and the connection rod is welded at the bottom of a slag clearing drum. The construction method is easy to implement, simple to operate, convenient to construct, reliable in piling quality, low in construction cost, high in bearing capability, simple in structure and convenient to use. Functions of a conventional base expanding device can be achieved, and the problem that a conventional base expanding drill bit can not effectively clear slag at the bottom of the pile is solved.

The invention relates to a water retaining coffer structure, which comprises two rows of posts; at least two coffers connected to each transverse direction of one row of posts; at least one row of upper steel drawing rod connected between two rows of posts. Wherein, said posts, coffers, and upper steel drawing rods form the solid frame; and the long blow stuff is filled with soil to be fixed into the frame. The invention has easy application.

The invention provides a pipe pile with post-pressure-grouting grouting pipes. The pipe pile comprises a pipe pile body, the grouting pipes which are arranged in the pipe pile body and symmetrically arranged with the axis of the pipe pile body as the center and a steel pile point arranged at the lower end of the pipe pile body. Slurry discharge holes are formed in the positions, corresponding to the pouring pipes, on the steel pile point. Blocking plates which are used for covering the slurry discharge holes and can be jacked up by the grouting pressure are welded to the positions corresponding to the slurry discharge holes in a spot welding manner. The two grouting pipes are vertically arranged. The pipe pile body is formed by the multiple-joint butt joint. Each grouting pipe comprises multiple sections matched with the sections, corresponding to the grouting pipe, of the pipe pile in length. The portions, close to the joints of the pipe pile body, of the sections of the grouting pipes are connected through pipe joints. By the adoption of the pipe pile with the post-pressure-grouting grouting pipes, the single-pile bearing force of the prefabricated concrete pipe pile is improved effectively, the modulus of compression of foundation soil is increased, the settlement of a building is reduced, the pile length is reduced, the number of piles is reduced, the stability of the building is guaranteed, and the building cost is saved.

The invention provides a pile space oil continuous reinforced pile group system and a construction method thereof. The pile space oil continuous reinforced pile group system comprises two and more foundation piles, a bearing platform, target layer pile space oil and non-target layer pile space oil; and the upper ends of the foundation piles are embedded in the bearing platform by a certain length, and are fixedly connected with the bearing platform, and the rest parts are buried in a pile space oil layer. The system adopts a foundation treatment technology to continuously reinforce the target layer pile space soil; and the reinforced target layer pile space soil forms a continuous high-strength whole in the horizontal direction to supply an excellent manual supporting layer to a pile group. The system can solve the problem of high or ultrahigh bearing force demand of a pile group foundation in a limited range by a lower manufacturing cost, such as large or superlarge foundations as bridges, wind power and petroleum platforms. The invention further provides the construction method of the pile space oil continuous reinforced pile group system.

The invention discloses a method of crude soil solidifying pile sinking used in building operation and its construction device. The method of pile sinking is that cut moving is stirred into stirred cut crude soil as pre-selected at pre-calculated position of the ground base; prepared curing agent is pressed into the stirred cut crude soil and stirred uniformly into solidified soil; the prefabricated pile is sunk into the solidified soil, the ground base is formed into crude soil solidified pile base. The construction device includes bottom head, stirring machine upright equipped on the bottom head, deep lift stirring machine equipped on the stirring machine upright, pile driver upright equipped on the bottom head, pile driver equipped on the pile diver upright. The advantage of the ground base formed by this method is high intension, strong bearing capacity, and low cost.

The invention discloses a tubular pile with unfolding blades. The tubular pile comprises a prefabricated tubular pile, wherein the prefabricated tubular pile is pressed into a soil layer through hammering or static pressure and comprises a mother pile and a pile tip; a cavity extending from the pile tail to the pile tip is formed in the pile body of the mother pile; a layer or a plurality of layers of blade jacking holes communicated with the cavity are formed in the pile wall of the mother pile in the length direction of the pile body; blades which can rotate around rotating devices and rotate towards the direction far away from the cavity are arranged at the upper edge far away from the cavity of each blade jacking hole; and a force applying part used for jacking the blades out of the blade jacking holes is arranged in the cavity. The construction method of the prefabricated tubular pile can be referred in an instruction book; and compared with a conventional prefabricated pile, the pile body is provided with unfoldable blades, so that the end-bearing effect of the pile is greatly improved, the bearing capacity of the pile is increased by multiple times or even tens of times, the number of used piles and the pile length can be greatly reduced, and the comprehensive benefits are extremely remarkable.

A double-row long-short combined landslide-resistant pile comprises a front-row landslide-resistant pile body and a rear-row landslide-resistant pile body and is characterized in that the front-row landslide-resistant pile body is a full-length type landslide-resistant pile, the rear-row landslide-resistant pile body is a buried landslide-resistant pile, the length of the load-bearing section of the rear-row pile body is reduced to reduce the landslide thrust borne by the rear-row landslide-resistant pile body, and the landslide thrust borne by the front-row landslide-resistant pile body is increased. Stress and deformation of the front-row landslide-resistant pile body and the rear-row landslide-resistant pile body are adjusted, the problem of uneven stress and deformation of the front-row landslide-resistant pile body and the rear-row landslide-resistant pile body is solved, and landslide-resistant effects of the landslide-resistant can be brought into play. In addition, the arrangement form of dense middle and sparse two sides allows the landslide-resistant piles on two sides a landslide mass are well brought into play.

The invention provides a high-bearing-force thin-wall steel tube concrete pile construction method and device and application thereof. An inward-beating method is used for achieving high bearing force, the technology of weakening the pile hole soil is used for solving the problem about the construction efficiency of the inward-beating method, the device is used for solving the problem about buffering and corrosion prevention, and therefore high-bearing-force thin-wall steel tube concrete pile construction has feasibility, the pile forming quality is good, the use amount of steel is small, operation is easy, control is easy, construction efficiency is high, reliable corrosion prevention is formed, durability and the mechanical property are good, and cost performance is high.

The invention discloses a double-row bottom-expanded long and short combined anti-slide pile for slope supporting. The double-row bottom-expanded long and short combined anti-slide pile comprises front-row bottom-expanded anti-slide pile bodies, rear-row bottom-expanded anti-slide pile bodies, pile top crown beams and connecting beams, both the front-row anti-slide pile bodies and the rear-row anti-slide pile bodies adopt bottom-expanded piles, and the pile length of the front-row bottom-expanded anti-slide pile bodies is less than that of the rear-row anti-slide pile bodies. Through the bottom expanding effect of the front-row anti-slide pile bodies and the rear-row anti-slide pile bodies, landslide thrust borne by the combined anti-slide pile is increased, force bearing and deformation between the front-row pile bodies and the rear-row pile bodies are regulated, and thus the anti-slide ability of the front-row pile bodies and the rear-row pile bodies can be given to full play; and meanwhile, the arrangement form that the position near a central line of landslide is dense and the two sides of the central line of the landslide are sparse is adopted so that the anti-slide pile bodies on the two sides of a landslide body can play a better role, and the landslide treatment cost is lowered.

The invention relates to an offshore wind-driven generator multi-pile-suction barrel-jacket foundation structure and a construction method thereof. The offshore wind-driven generator multi-pile-suction barrel-jacket foundation structure and the construction method thereof are simple in structure, convenient to construct, low in cost, safe and stable. According to the technical scheme, the offshorewind-driven generator multi-pile-suction barrel-jacket foundation structure is characterized in that a plurality of suction barrels are uniformly arranged at the bottom of a jacket, wherein guide sleeves communicating with the interiors of the suction barrels are arranged in the centers of the tops of the suction barrels; the jacket is supported on a seabed through the suction barrels and fixed to the seabed through steel pipe piles inserted into the guide sleeves and driven into the seabed; and high-strength grouting materials are poured into gaps between the guide sleeves and the steel pipepiles. The offshore wind-driven generator multi-pile-suction barrel-jacket foundation structure and the construction method thereof are suitable for the technical field of ocean engineering.

The invention discloses a tube pile provided with a posttensioned prestressing steel noose and a posttensioned prestressing pulling tube pile, comprising a tube pile body and a bearing platform board at the upper end of the pile body, a hole is arranged at a circle of coaxial line in the pile body, the lower end of the posttensioned prestressing steel noose is provided with the expanded head, the upper end penetrates through the hole arranged on the pile body, is tensioned and is connected and fixed by virtue of a connecting piece, and the upper end of the steel noose and the connecting piece thereof are arranged in the bearing platform board. By adopting the invention, application range of the tube pile is expanded, posttensioned prestressing is adopted, rigidity of the pile body is greatly improved, the pile body is extruded under the prestressing longitudinal action and is radially enlarged, soil body is extruded, and uplift resistance is improved, thus pile length can be shortened; and meanwhile cracking phenomenon as the pile body is tensioned is overcome.

The invention discloses a fan bearing platform assembly improving pile uplift bearing capacity. The fan bearing platform assembly comprises a bearing platform and foundation piles supporting the bearing platform; the bearing platform comprises a cylindrical upper platform column, a middle cylindrical middle platform column, a lower inverted circular truncated cone and an annular bottom convex platform which are concentrically connected in the axial direction; the diameter of the upper platform column is smaller than that of the cylindrical middle platform column, the large diameter of the upper portion of the lower inverted circular truncated cone is equal to the diameter of the cylindrical middle platform column, and the outer diameter of the bottom convex platform is equal to the small diameter of the lower portion of the lower inverted circular truncated cone; an anchor bolt cage connected with a fan tower barrel stretches into the bottom of the bearing platform; a lower anchor plate of the anchor bolt cage is located in the bottom convex platform, and an upper anchor plate of the anchor bolt cage is located above the upper platform column; the conical surface of the inverted circular truncated cone and the surface of the bottom convex platform are coated with cushion layers; and the bottom of the bearing platform is vertically provided with one or more circles of cylindrical foundation piles. By inverting a traditional bearing platform type structure, the thickness of a soil covering body is decreased, the excavation quantity and the backfill quantity of bearing platform soil are substantially reduced, the vertical pressure of the piles is reduced, the uplift force of the piles is increased, and the construction difficulty is lowered.

The invention discloses an h-shaped double-row pile structure provided with a core-entraining jet grouting pile, and belongs to the field of building foundation pit engineering. The h-shaped double-row pile structure comprises a plurality of front rows of piles, a plurality of rear rows of piles, the jet grouting pile, a precast reinforced concrete square pile, an expanded-head anchoring body, a top beam I, a top beam II, a top beam III and a connecting beam, wherein the front rows of piles and the rear rows of piles are arranged in parallel and form an h shape; the top beam I, the top beam I and the top beam III are respectively arranged on each front row of pile, each rear row of pile and the jet grouting pile; the top beam I and the top beam II are connected through the connecting beam; the jet grouting pile with a large inclination angle is arranged between the piles in each group of rear rows from the inner side of a pile top platform of each front row of piles; the jet grouting pile is constructed by a sectional jet grouting manner, and the jet grouting diameter of the tail end is correspondingly increased to form the expanded-head anchoring body; after the construction of the jet grouting pile, the precast reinforced concrete square pile is inserted into the jet grouting pile before the mass is stabilized; the jet grouting solidifying body in sectional construction can be closely matched with the earth at the back of the pile and integrally connected with the earth at the back of the pile through a precast reinforced concrete pile.