77results about How to "Reduce the crowding effect" patented technology

The invention discloses a prestressed concrete precast pile. The prestressed concrete precast pile comprises a precast pile body with a square cross section, wherein the precast pile body comprises two end plates, a pile body and prestressed reinforcements, the pile body is arranged between the two end plates, and the prestressed reinforcements are arranged in the pipe body and connected with the two end plates; bulge rib which longitudinally extends to an end and a first groove which longitudinally extends and penetrates through the end are arranged on an outer side surface of the precast pile body; and a second groove and a third groove which are corresponding to positions of the bulge rib and the first groove respectively, matched in shape and size and longitudinally extend and penetrate through an end of the precast pile body are formed in one outer side surface which is not adjacent to the outer side surface. According to the prestressed concrete precast pile, the construction is convenient, the engineering cost can be reduced, the water stopping effect is enhanced, and the prestressed concrete precast pile has good bending and shearing resistance.

The invention relates to a maintenance structure for a foundation pit next to an existing building. The maintenance structure is characterized by mainly comprising a cement mixing pile water stop curtain, a cast-in-situ bored pile support pile, non-soil-squeezing anti-overturning piles and a slant pull rod, wherein the cast-in-situ bored pile support pile, the cement mixing pile water stop curtain and the non-soil-squeezing anti-overturning piles are sequentially arranged on the outer side of a foundation pit excavation side boundary from inside to outside; a raft plate is arranged in a pile body top area from the non-soil-squeezing anti-overturning piles to the cast-in-situ bored pile support pile, and a continuous perforated steel plate is arranged on the top of the raft plate; the upper portion of the slant pull rod is arranged on the continuous perforated steel plate on the tops of the non-soil-squeezing anti-overturning piles, the lower portion of the slant pull rod is arranged on the outer side of the cast-in-situ bored pile support pile, and the two ends of the slant pull rod are each fixed with an anchorage device, a base plate and a pedestal. The foundation pit maintenance structure effectively solves the technical problem that the foundation pit next to the existing building is hard to support, and has good technical and economical benefits.

An ecological landscape combination revetment comprises stress piles and inserting sheet piles, wherein, the inserting sheet piles are used for being in fit connection with the stress piles and used for blocking soil and stopping water, the left and right sides of one of the stress piles and the inserting sheet piles are correspondingly provided with inserting slots extending in the longitudinal direction, and the left and right sides of the other one of the stress piles and the inserting sheet piles are correspondingly provided with inserting parts which extend in the longitudinal direction and are matched with the corresponding inserting slots in a mutual abutting mode. A new technical scheme of the ecological landscape combination revetment is provided, the ecological landscape combination revetment is mainly composed of the stress piles and the inserting sheet piles, every two stress piles are connected through one inserting sheet pile for blocking soil and stopping water, the stress piles and the inserting sheet piles adopt two specifications, and the requirements for revetment and supporting stress can be met; and the skipped piling construction method is adopted during construction, thus the soil-squeezing effect is weakened, the positioning accuracy is high, and the effect of the formed surface is good.

The invention discloses a high-pressure spray pile vibrosinking device. Ground components comprise a vertical exciting force generator and a pile gripper which is connected with the vertical exciting force generator; the lower part of the vertical exciting force generator is connected with an outer high-pressure joint which is connected with a high-pressure spray generator; underground components comprise an inner joint which is connected with the lower end of the pile gripper and a spray pipe which is connected with the inner joint; the end of the spray pipe is provided with a high-pressure spray nozzle; a horizontal exciting force generator is arranged between the spray pipe and the high-pressure spray nozzle; and the high-pressure spray generator sprays to inject slurry or water, the sprayed liquid forms a high-pressure liquid column to cut, crush and liquefy soil, the horizontal exciting force generator generates vibratory force in a horizontal direction so as to vibrate the cut, crushed and liquefied soil, and a pile body is quickly pressed into a formation to reach a preset pile sinking depth, so that a technology for constructing difficult and different formations can be provided, and the construction benefit and quality can be greatly improved.

The invention relates to a highway-foundation construction method and particularly relates to a construction method for combining composite foundations of rigid piles and soft-soil foundations of water-draining consolidation and reinforcement highways. The construction method comprises the construction steps of paving a working cushion layer; adopting a bagged sand well as a vertical water-draining body, adopting vibratory tube sinking to lower the bagged sand well, carrying out vibratory tube pulling, and supplementing materials at an empty well section in the tube pulling process; driving rigid piles, carrying out vibratory tube pulling after filling up concrete into sleeves by a mode of vibratory tube sinking, wherein the tube pulling speed is less than 1.2m/minute, and the tubes cannot be inserted inversely in the process of vibratory tube pulling; and casting pile caps, and adopting an inverse excavation construction method to cast the pile caps in constructed working cushion layers or filled soil; and backfilling roadbeds, arranging a settlement plate on column tops and among columns, filling to the height of less than 5m and adopting a vibratory pressing machine for flattening. Compared with the construction method for composite foundations of pile supporting dikes and rigid piles, the construction method for combining the composite foundations of the rigid piles and the soft-soil foundations of the water-draining consolidation and reinforcement highways has the advantage that the cost can be respectively saved by 40% and 46%.

The invention discloses a cut and get core machine of status quo soft clay hollowness column sample. It has pile casing, setting up the cutting edge on the superior extremity of pile casing, the inferior extremity of the pile casing connects with pallet of dismantle type pile casing by pile casing pallet hyphen pile casing fixed screw, fixing the dismantle type filling soil torr on the surface of the dismantle type pile casing pallet, fixing the pressure release hole on the dismantle type filling soil torr, fixing the direct bit in the middle of pile casing, the direct bit is made up of auger bit and inner margin blade, and connects with the drill pipe, the drill pipe traverses dismantle type filling soil torr, pallet of dismantle type pile casing, and is fixed by filling soil torr hyphen drill pipe fixed screw,pile casing hyphen drill pipe fixed screw, the dismantle type blade slice is made up of the inner margin blade,level blade, and connects stiffly with the direct bit by blade fixed screw. The pile casing is cylindrical form. The cut and get machine can prepare successfully status quo soft clay hollowness column sample, the disturbing of bringing in the process of cutting,the influence of hustle soil is small, providing the equipment bond guarantee for the experimental investigation of status quo soft clay under the complex stress condition.

The invention relates to a tri-tube tri-high-pressure jet grouting pile construction method, and belongs to the field of constructional engineering. The tri-tube tri-high-pressure jet grouting pile construction method comprises the following steps: a first step of measuring, paying off and positioning, wherein measurement is performed according to a designed construction drawing, and a construction axis is paid off; a second step of guiding a drilling machine to be in place, wherein the drilling machine is mounted on a designed pile position, and a drill bit of the drilling machine is alignedto the center of the pile position; a third step of drilling, protecting walls and forming holes, wherein the drilling machine is used for drilling holes, and the walls are protected with mud until hole depth achieves designed elevation; a fourth step of separately forming a mud outlet, a water outlet and a gas outlet in the bottom end of a grouting rotary-jetting tube, wherein a pressure value ofair sprayed out by the gas outlet ranges from 1.6 MPa to 2.2 MPa, the water outlet is positioned above the mud outlet and the gas outlet, and the water outlet in the rotary-jetting grouting tube is drilled for washing and reaming while the jetting grouting tube carries out grouting; a fifth step of flushing; and a sixth step of moving the machine. A relatively great gap is formed between the grouting tube and the hole wall, so that pressure in holes is conveniently released, and high water pressure is reduced.

The invention discloses an inner drilling machine and a construction method thereof. The inner drilling machine comprises a tunneling and drilling machine; the tunneling and drilling machine comprises a reducer, a fixture, a driving device and a drilling tool; the fixture is arranged on the reducer; a through hole is formed in the drilling tool, and an outlet of the through hole is formed in the bottom of the drilling tool; the drilling tool comprises a drill bit, a drilling rod and a helical blade; the drilling rod is connected with the reducer; the drilling rod is divided into a plurality of sections which are connected through drilling rod joints; and the drilling rod joints adopt male and female joints. According to the inner drilling machine and the construction method thereof, when the inner drilling machine is adopted in construction for precast hollow piles, simultaneous conducting of guiding holes and pressing piles can be achieved without changing original pile machine structure; and the inner drilling machine is low in cost, simple in structure, small in self-weight, convenient to construct, low in noise, low in vibration, friendly in environmental protecting and high in efficiency, and the problem of difficult construction of prefabricated hollow piles in dense sand layer geology can be effectively solved.

The invention provides a C-type closed material yard pile construction method which includes the steps: partitioning, to be specific, dividing a C-type closed material yard pile into a plurality of construction sections along the length direction of the C-type closed material yard pile, and arranging a stress buffer area in the middle of the C-type closed material yard pile; piling, to be specific, piling the construction sections and the stress buffer area, and symmetrically piling middle retaining wall foundation piles, low wall and rail foundation piles and factory column foundation piles in adjacent construction sections towards the left side and the right side from boundaries of the construction sections. The C-type closed material yard pile is divided into a plurality of constructionsections by the aid of partitioning and sectioning principles, simultaneous piling is performed, and construction cycle is ensured. The middle retaining wall foundation piles, the low wall and rail foundation piles and the factory column foundation piles in the adjacent construction sections are piled towards the left side and the right side from the boundaries of the construction sections, piling directions are opposite to decrease squeezing effects, the problem of pile sinking difficulty is avoided, and piling quality is ensured.

The invention relates to a carbon fiber cloth bag cast-in-situ anti-arch curved surface combined irregular-shaped pile, which is characterized in that the upper part of the combined irregular-shaped pile is a round pile body while the lower part thereof is an anti-arch curved surface pile body, and the pile bottom is provided with an irregular-shaped prefabricated pile tip. A carbon fiber cloth bag wraps the outside of the pile body; a steel sleeve with a reinforcing plate is arranged on the top part of the combined irregular-shaped pile; a vertical drain body is filled in the cavity at the outer side of the round pile body; a vertical drain pipe communicated with the vertical drain body is preset in a cast-in-situ cover plate on the top part of the pile. The carbon fiber cloth bag arranged on the outer side of the pile body can reinforce the pile body, improve the stress performance of the pile body and enhance the integrity of the pile body; the section of the pile body on the lower part is an anti-arch curved surface which can prevent influence from excessive fullness of concrete of the pile body to the lateral friction of the pile; the section of the pile body on the upper part is round and can reduce the influence from the lateral negative friction of the pile to the performance of the pile body. The invention also discloses a construction method of the combined irregular-shaped pile.

The invention discloses a precast concrete post grouting pile which comprises a post grouting pile body, a reinforcement cage framework, flanges, a post grouting tank, a post grouting pipe, a grouting hole and a pile bottom filler, wherein the reinforcement cage framework comprises longitudinal ribs and surrounding ribs; one end or two ends of the framework are welded with the flanges; at least one post grouting pipe runs through the center or the side edge position of the framework or the center and the side edge position of the framework; one end of the post grouting pipe is provided with the grouting hole; the grouting hole is positioned in the post grouting tank; and the post grouting tank is arranged on the post grouting pile body. In the constructing process, the post grouting pile is sunken and immediately, cement paste or powder paste with a specific surface area of 2,500 to 6,500kg/cm<2> is injected into the post grouting pile body by the grouting pipe, so that sufficient adhesion of the grouted paste and a soil layer around the pile is ensured. The precast concrete post grouting pile can realize improvement on rock and soil common resistance of soil and the pile so as to further play bearing capacity of the pile; and meanwhile, the number of the used piles can be reduced and engineering cost is reduced.

The invention discloses a novel prefabricated drainable pipe pile and a preparation and construction method thereof, belonging to the field of geotechnical engineering. The invention includes: a prefabricated pipe pile body, longitudinal and transverse reserved grooves on the pile surface, a permeable concrete layer, corresponding pipe pile end plates and the like. The present invention fills the grooves reserved longitudinally and transversely on the side walls of the prefabricated pipe piles with permeable concrete as the drainage channel for the pore water in the soil, and connects the piles through the corresponding pipe pile end plates designed by the present invention to ensure the connection between the piles. The drainage path behind the pile is unobstructed. The application of the present invention can reduce the soil squeezing effect in the process of sinking piles, accelerate the consolidation of soil between piles, increase pile side friction, effectively reduce the vertical and horizontal displacement of adjacent piles, and improve the bearing capacity of pile foundations ; It can also reduce the post-construction settlement and negative frictional resistance of the pile side soil. The invention has the advantages of simple structure, factory production, high construction efficiency and remarkable actual social and economic benefits.

The invention relates to a perforated pipe method super-deep, fast, and super-large diameter high pressure chemical churning pile construction method. Two high pressure curing liquid and compressed air injection openings and a high pressure water pipe injection opening and compressed air water injection nozzle are arranged on the lower side of a drill, the position of the high pressure water pipe injection opening and compressed air water injection nozzle is above the position of the high pressure curing liquid and compressed air injection openings, and the two pressure curing liquid and compressed air injection openings are in the symmetric positions of the same flat surface; the high pressure water pipe injection opening downward injects water to conduct cutting, the lower side of a drill stem is higher than a bottom label of a designed pile, then the high pressure water pipe injection opening and compressed air injection nozzle injects a high pressure water pipe injection flow and compressed air injection flow, and the high pressure curing liquid and compressed air injection openings inject high pressure curing liquid and compressed air injection flow. With the drill stem rotating and lifting, adjacent soil body is conducted a secondary cutting, and cement paste and soil are mixed to a pile. Compared with the prior high pressure chemical churning pile, the overall pile formation efficiency is increase by almost 48%.

The invention relates to a treatment method of a drainage pipe pile composite foundation. The treatment method comprises the following steps: arranging drainage pipe piles according to a certain distance in a soft clay foundation; arranging drainage cushion layers on the top surfaces of the drainage pipe piles or pile caps; when the pile caps are arranged on the top of the drainage pipe piles, arranging preformed holes on the pile caps so as to ensure that the pipe pile holes are communicated with the drainage cushion layers; and arranging a certain number of small holes penetrating through pipe walls on the pipe walls of the drainage pipe piles so that underground water in soil among the piles can flow into the pipe pile holes via the small holes and then is drained via the preformed holes and the drainage cushion layers on the pile caps. Therefore, by means of the treatment method of the drainage pipe pile composite foundation, the dissipation of excess pore water pressure in the soil among the piles can be enhanced, the soil compacting effect generated by pipe pile construction can be reduced, and the load carried by the soil among the piles or post-construction settlement caused by self weight of foundation soil can be reduced.

The invention belongs to the field of geotechnical engineering, and particularly relates to a foundation treatment structure suitable for a deep soft foundation with a sandwiched thin bearing stratumand a construction method. The foundation treatment structure comprises a raft, a mattress layer, pipe piles and stirring piles, wherein the mattress layer is arranged at the bottom of the raft and located at the top of an upper soft soil foundation layer; the pipe piles are arranged at intervals and arranged at the bottom of the mattress layer, and the lower ends of the pipe piles are located ina middle bearing stratum; and the stirring piles are arranged at intervals and arranged at the bottom of the mattress layer and located in the upper soft soil foundation layer. According to the foundation treatment structure suitable for the deep soft foundation with the sandwiched thin bearing stratum, the engineering investment is saved; and settlement of a composite foundation is reduced, the bearing capacity of the composite foundation is improved, and the problems that the foundation settlement is large, the foundation bearing capacity is low and the pipe piles are prone to piercing the middle bearing stratum when the pipe piles are located in the middle bearing stratum are solved.