45results about How to "Improve pile sinking efficiency" patented technology

The invention discloses a water jet sprayer assisting an offshore platform in sinking a pile. The water jet sprayer comprises a barrel body with a water inlet and a water outlet, and a core tube arranged in an inner cavity of the barrel body, wherein a hollow core tube inner cavity is formed in the core tube; a plugging member for selectively plugging the water inlet is arranged on the top of the core tube; an annular baffle plate with a plurality of water holes, a plurality of water channels extending along an axial direction of the core tube, a guide impeller with spiral guide blades and a spiral nozzle which is arranged at the bottom of the core tube and provided with a spiral channel are sequentially arranged on the core tube below the plugging member; and an outer ring nozzle is formed between the outer wall of the spiral nozzle and the inner wall of the water outlet of the barrel body. During pile sinking, the water jet sprayer jets high-pressure water at high speed in the form of combined jet flow to scour a soil body in the pile, so that soil blockage in the pile can be removed effectively, the power pile sinking resistance is reduced, the pile sinking efficiency is improved, and aims of shortening the platform construction period and reducing the construction cost are fulfilled.

The invention relates to the technical field of foundation stabilization, in particular to a precast pile post-grouting device and a precast pile post-grouting process. The technical scheme adopted by the invention is that the precast pile post-grouting device comprises a precast pile, a stirrer, a slurry tank, a grouting pump and a grouting hose; a pile body of the precast pile is provided with a prestressed reinforcement, a spiral bar, an upper end plate and a lower end plate. The precast pile post-grouting device is characterized in that grouting holes are also formed in the precast pile, and the precast pile is also provided with grouting pipes, an upper transition pipe and a lower transition plate. Compared with the prior art, the precast pile post-grouting device and the precast pile post-grouting process have the beneficial effects that a construction process of pile tip and pile tip peripheral grouting and the arrangement form of the grouting pipes can be realized on piles with various pile diameters (large diameters and small diameters), various pile types (square piles, round piles, hollow piles and solid piles) and various pile lengths (short piles and long piles), and the problems of a post-grouting construction method of all precast pile types are solved.

The invention relates to a water-flushing sinking-assisting system. Two water jet pipes and an air pipe are preembedded in a pile body of a precast pile, water inlet ends of the two water jet pipes are connected to a quick joint and then connected to a double-table water pump, and a side wall of the pile body is provided with three outer drainage holes communicated with a pile core; a pile tip isa funnel shaped steel pile tip welded by a steel plate; and the two water jet pipes at the pile tip flush water directly along the pile axial line direction. The invention has the advantages that because the three outer drainage holes with the diameter of 70mm, reserved at the pile body, are communicated with the pile core, the effective length of an inner drainage slurry channel is reduced so asto drain away water and sand; because a water pipe and the air pipe are preembedded in concretes, the pipes are unnecessary to pull out, an internal thread bend elbow of 90 DEG is adopted at a water inlet end and an air inlet end so as to connect the quick joint; and because the quick joint is utilized, the assembly and disassembly are quick, the steps of assembling and disassembling the water pipe and the air pipe are effectively avoided, the operation is simple, the cost is lower, and the pile-sinking efficiency is improved.

The invention discloses a hammering pile sinking and synchronous pile tip and side grouting structure and a hammering pile sinking and synchronous pile tip and side grouting process in a pile tip of apile shoe-provided pipe pile, and belongs to the field of a construction method.. According to the grouting method, a center penetrating hammer is used for hammering the pile tip to expand a pile shoe so that the pile tip can be hit into the pile shoe; the pile tip sinks and takes a pre-stressed pipe pile to sink together; and the pile tip and the pile side are synchronously expanded to realize grouting treatment inside a grouting passage. The grouting structure disclosed by the invention is relatively high in hammering penetration capability; a synchronous grouting system can commendably play a lubrication effect in a pile sinking process and can reduce the friction resistance of the pile side; after pile sinking is ended, the strength improvement can provide a higher single pile bearingcapacity; a hammering process is performed under the ground; construction noises can be controlled commendably; and the height of an elevator is adjustable, namely the hammer drop journey can be corrected according to the geological conditions of the current pile sinking depth, so that higher pile sinking efficiency is achieved. The structure and the process disclosed by the invention have low requirements on equipment; the bearing capacity of an equipment platform generally needs not to be specially treated, all equipment can be recycled after the construction is ended, and good economicalbenefits are realized.

An H-shaped supporting pile made of prefabricated reinforced concrete comprises an H-shaped hoop and an H-shaped standard reinforced concrete pile section, wherein the H-shaped hoop is formed by a steel reinforcement framework, provided with an H-shaped section and comprises a vertical stirrup, a triangle frame hoop and an 'S'-shaped stirrup, the bottom edges of the triangle frame hoop are connected with a plurality of main reinforcement ribs longitudinally, the inner side of the 'S'-shaped stirrup is connected with longitudinal inner reinforcement ribs longitudinally, wedge-shaped recesses are arranged on both the left and the right side of the H-shaped hoop, and two ends of the H-shaped standard reinforced concrete pipe section are provided with pile head portions. The H-shaped supporting pile is provided with the optimum section characters of a horizontal force resistant pipe for bearing side earth pressure, and the steel reinforcement ribs and concrete can be obviously saved; industrialized production of shaped commercial piles is realized, pile sinking efficiency is improved, and labor force is reduced; and construction of high-pressure spinning spraying piles between every two piles is realized, anti-seepage probability is improved since cement slurry sprayed by the high-pressure spinning spraying piles is restrained by the H-shaped section.

The invention provides a pile sinking construction method based on an assembly movable platform. The method comprises the following steps that a, steel pipe piles are constructed in a plate pile construction area in the plate pile paving direction side by side; b, the tops of each row of steel pipe piles are provided with a transverse beam; c, longitudinal beams are uniformly arranged between every two transverse beams at intervals and are distributed in the plate pile paving direction; d, panels parallel to the transverse beams are arranged on the longitudinal beams; e, crawler cranes are placed on a walking plane; f, guiding frames are erected between the tops of the two transverse beams which are not provided with the panels; g, plate piles are lifted through the crawler cranes, and the plate piles are constructed after being subjected to guiding positioning through the guiding frame; and h, the panels, the longitudinal plates and the guiding frames between the two transverse beams close to the plate piles are disassembled, and the steps from f to g are repeated in the area where the plate piles are not constructed. According to the pile sinking construction method based on the assembly movable platform, the stress is clear, the method cannot be influenced by wind waves, and the precision and efficiency of pile sinking are high.

The invention belongs to the field of constructional engineering, and particularly relates to a concrete prefabricated pipe pile only bearing an anti-drawing effect. The concrete prefabricated pipe pile only bearing the anti-drawing effect comprises a concrete prefabricated pile body, a detachable hollow guide rod and a metal pile tip. The concrete prefabricated pile body is provided with a pile top and a pile bottom. The concrete prefabricated pile body is driven into foundation soil. The detachable hollow guide rod is arranged in a cavity of the concrete prefabricated pile body, a pile tip connecting thread is arranged at the bottom end of the detachable hollow guide rod, a guide rod connecting thread is arranged at the top end of the metal pile tip, and the detachable hollow guide rod is in threaded connection with the metal pile tip. The concrete prefabricated pipe pile has the following beneficial effects that the metal pile tip is arranged on a pile tip of the concrete prefabricated pipe pile, pile sinking pierces into soil mass to more easily penetrate through a hard soil layer, the efficiency of pile sinking is improved, and disturbance for the surrounding soil mass is reduced; and the pile tip can be recycled, a cavity can be formed between the pile tip and the foundation soil, the purpose of saving materials is achieved, the size of the metal pile tip can be customized, and the use range is wide.

The invention relates to a pile stabilizing frame for pile sinking of an offshore wind power batter pile group and a pile sinking method. The pile stabilizing frame comprises a supporting frame, a first limiting frame and a second limiting frame; the first limiting frame and the second limiting frame are arranged at two opposite ends of the supporting frame correspondingly; rotatable first batter pile positioning mechanisms are arranged on the first limiting frame; a plurality of second batter pile positioning mechanisms are arranged on the second limiting frame; and on a horizontal plane, the projection area of the first limiting frame is smaller than or equal to the projection area of the second limiting frame. According to the pile stabilizing frame, fixing and inclination adjusting of a plurality of batter piles can be achieved, the batter piles do not need to be hoisted by moving ship position for multiple times, on the one hand, the safety risk is reduced, on the other hand, the working procedures can be reduced, the pile sinking efficiency is improved, and then the installation cost is saved. The rotatable second batter pile positioning mechanisms are arranged to be matched with the plurality of first batter pile positioning mechanisms, so that the overall weight of equipment can be reduced, the production and installation difficulty is reduced, and the cost is saved.

A prestressed reinforced concrete H-shaped support pile based on a pre-tensioning method comprises a standard pile section provided with a reinforcement cage, wherein the reinforcement cage is composed of erection reinforcing steel bars, an H-shaped steel hoop and an S-shaped steel hoop, the upper flat surface and the lower flat surface of the cross section of the reinforcement cage are provided with a plurality of horizontally and symmetrically arranged high-strength prestressed steel bars, the standard pile section is manufactured by the adoption of a steel die, the steel die comprises bottom channel steel and a turnable protruding side template, fixing stand columns are arranged on two sides of the protruding side template, pivots of the protruding side template are connected to two sides of the bottom channel steel, the upper ends of the fixing stand columns are connected with limiting channel steel, the two ends of the reinforcement cage are respectively provided with an end template provided with a plurality of horizontally-arranged through holes, and the through holes are matched with the prestressed steel bars. The prestressed reinforced concrete H-shaped support pile has the advantages that excellent anti-bending cross-section characteristic is achieved, and compared with a drilling poring pile normally adopted in a support pile, 40-50% of steel bars and 30-40% of concrete can be saved, and significant economic and technological effects are achieved.

The invention discloses a positioning and pile sinking device of self-transportation buried piles, and relates to the technical field of pile sinking equipment of positioning piles. The device comprises a positioning device, a transportation device and a pile sinking device; the positioning device includes a baseplate, a distance controller and a driving wheel; the transportation device includes a belt connecting rod, a conveying belt and belt limiting grooves; and the pile sinking device includes a pile sinking connecting plate, a pile sinking lifting rod, a pile sinking block, a pile sinking turner, a turnover plate, a turnover plate limiting groove, a rotating buckle and a rotating baseplate. The device uses the distance controller for controlling the driving wheel to perform the pile sinking positioning, and is provided with the conveying belt and multiple belt limiting grooves in the conveying belt for carrying and transporting positioning piles; in the pile sinking place, the positioning piles on the conveying belt are conveyed into the turnover plate limiting groove of the turnover plate, and are overturned by the pile sinking turner; and the pile sinking lifting rod drives the pile sinking block to repeatedly beat to finish the pile sinking work, so that the pile sinking efficiency is high, the labor intensity of workers is low, and the modern building demands are accorded with.

The invention discloses a pile-sinking construction method for a deep riprap unfavorable geologic region, and the pile-sinking construction method firstly performs earthwork replacing operation of a vertical enclosure structure area, and performs vertical pile construction or steel plate pile enclosure structure construction in an area in which replacement is completed. The pile-sinking construction method is characterized in that the earthwork replacing operation comprises the following steps: (1) measuring, paying off and positioning; (2) defining one group by a plurality of pile tubes which are arranged in parallel and are provided with movable pile tips, and performing pipe-sinking construction; (3) backfilling fine grained soil into one group of immersed tubes which are constructed; (4) after earthwork backfilling is completed, reserving the last pile tube as the first one of a next group, pulling off the rest of the pile tubes, thereby forming a cob wall; and (5) repeating steps (2) to (4), and performing pipe-sinking backfilling operation of the next group of pile pipes until earthwork of the vertical enclosure structure area is replaced. The pile-sinking construction method is convenient in construction, is high in pile sinking efficiency, is low in construction cost, and can strength the water-stop effect of the vertical enclosure structure.

The invention relates to the technical field of steel pipe pile sinking construction, in particular to a pile sinking construction method based on a jacking-pushing walking platform. A track beam is erected on a constructed a first round of steel pipe piles, then the walking platform is installed on the track beam, a crawler crane and a guide frame on the walking platform are adjusted, and a second round of steel pipe piles are inserted and piled through the crawler crane and the guide frame. A new track beam is erected to connecting all the second round of steel pipe piles, the jacking-pushing walking platform moves to the second round of steel pipe piles along the new track beam, the crawler crane and the guide frame are adjusted, inserting piling construction of a third round of steel pipe piles is completed through the crawler crane and the guide frame, and construction is conducted sequentially alternatively till construction of all steel pipe piles is completed. According to the pile sinking construction method based on the jacking-pushing walking platform, the structure is simple, and operation is convenient. The inserted-piled steel pipe piles are used as pile sinking foundations so that the stability of a pile sinking construction platform can be improved to a great extent, the accuracy of pile sinking construction is ensured, and the construction procedures are simpler.

The invention relates to a prestressed concrete composite pile, in particular to a prestressed concrete composite pile adopting post-tensioning method prestress tension. A deconstructed finite elementassembled prestressed pile suitable for pile bottom hammering pile driving comprises a pile body and a pile top. The pile body comprises a pile body plate I and a pile body plate II, a hollow pile body is defined by the pile body plate I and the pile body plate II, and flange structures are embedded into the top and the bottom of the pile body. The middle of the pile top is hollow consistent withthe pile body, a preformed hole allowing a longitudinal prestressed reinforcement to be inserted is formed in the pile top wall in the longitudinal direction, and transverse reinforcements are distributed in the transverse direction at certain intervals. The deconstructed finite element assembled prestressed pile has the beneficial effects that the standard degree is high, and the construction end product quality is high; the product anti-cracking ability is good; noise in the pile driving process can be greatly reduced; concrete can be poured after pile driving is carried out, and the hollowportion can be reserved according to the work condition and design requirements; the pile body wall is adopted as one part of the pile, and the wall protection function of the whole pile is achieved;and multiple piles can be spliced through upper flanges and lower flanges.

The application discloses a pneumatic sinking and floating self-pressing pile net cage device and relates to the technical field of marine culture. The pneumatic sinking and floating self-pressing pile net cage device comprises a net cage structure, a pile leg and a hydraulic lifting device. The net cage structure comprises a stand column, a supporting rod, an enclosure and a net cover. The stand column and the supporting rod enclose a culture space. The net cover is connected to the supporting rod. The pile leg is provided with a bolt hole in the circumferential direction. The hydraulic lifting device comprises a hydraulic oil cylinder and a bolt. The hydraulic lifting device is connected to the stand column. The bolt of the hydraulic lifting device is inserted into the bolt hole of the pile leg and can drive the pile leg to move up and down along the actuating direction of the hydraulic oil cylinder. The net cage structure relies on the dead weight to press the pile leg into the soil to realize fixation.

The invention relates to the technical field of foundation stabilization, in particular to a precast pile post-grouting device and a precast pile post-grouting process. The technical scheme adopted by the invention is that the precast pile post-grouting device comprises a precast pile, a stirrer, a slurry tank, a grouting pump and a grouting hose; a pile body of the precast pile is provided with a prestressed reinforcement, a spiral bar, an upper end plate and a lower end plate. The precast pile post-grouting device is characterized in that grouting holes are also formed in the precast pile, and the precast pile is also provided with grouting pipes, an upper transition pipe and a lower transition plate. Compared with the prior art, the precast pile post-grouting device and the precast pile post-grouting process have the beneficial effects that a construction process of pile tip and pile tip peripheral grouting and the arrangement form of the grouting pipes can be realized on piles with various pile diameters (large diameters and small diameters), various pile types (square piles, round piles, hollow piles and solid piles) and various pile lengths (short piles and long piles), and the problems of a post-grouting construction method of all precast pile types are solved.

The invention provides a prefabricated and movable type platform for pile sinking. The prefabricated and movable type platform for pile sinking is characterized by comprising multiple steel pipe piles which are distributed side by side in the sheet-pile laying direction, wherein the tops of each row of steel pipe piles are provided with a cross beam, longitudinal beams are arranged at equal intervals between every two adjacent cross beams in the sheet-pile laying direction, no longitudinal beam is arranged between the two cross beams located on the edge of a sheet-pile construction area, face sheets are distributed between every two adjacent cross beams, the multiple face sheets are supported on the upper portions of the longitudinal beams and form a walking plane, crawler cranes are placed on the walking plane and can normally walk on the walking plane, no face sheet is arranged between the two cross beams on the edge of the sheet-pile construction area, the two cross beams on the edge of the sheet-pile construction area are located outside the walking plane, and guide frames are arranged between the tops of the two cross beam not provided with the face sheet. The prefabricated and movable type platform for pile sinking is clear in stress, free from the influence of stormy waves and high in pile sinking precision and efficiency.

The invention belongs to the field of construction engineering, and in particular relates to a concrete prefabricated pipe pile which only bears the anti-pulling effect. Concrete prefabricated tubular piles that only withstand uplift, including: concrete prefabricated pile body, detachable hollow guide rod, metal pile tip, concrete prefabricated pile body with pile top and pile bottom, concrete prefabricated pile body driven into the foundation soil; concrete The cavity of the prefabricated pile body is provided with a detachable hollow guide rod, the bottom end of the detachable hollow guide rod is provided with a pile tip connecting thread, and the top end of the metal pile tip is provided with a guide rod connecting thread, and the detachable hollow guide rod is connected with the metal pile tip thread. connect. The invention has the following beneficial effects: as for the metal pile tip, as for the concrete prefabricated pipe pile tip, the pile tip can penetrate the hard soil layer more easily, improve the pile driving efficiency, and reduce the disturbance to the surrounding soil body; Recycling and reuse can form a cavity between the pile tip and the foundation soil to save materials. The size of the metal pile tip can be customized and used in a wide range.

The invention discloses a pile sinking device for assisting a precast hollow pile in a permafrost region, which comprises a pile body, an auxiliary cylinder is movably mounted in the pile body, an electric heating block capable of penetrating through the bottom of the pile body is fixedly connected to the bottom of the auxiliary cylinder through a connecting rod, the pile sinking device further comprises a medium pipe extending out of the auxiliary cylinder from the inside of the auxiliary cylinder, and the two ends of the medium pipe extend out of the pile body. And a fixing device is also arranged on the auxiliary cylinder. The auxiliary cylinder and the electric heating block are mounted in the pile body, so that the electric heating block extends to the bottom of the pile body, and during pile sinking operation, the electric heating block is electrified and generates heat to melt frozen soil at the bottom of the pile body and reduce the hardness of the frozen soil, so that the pile sinking operation is easier to perform, and the pile sinking efficiency is improved; and meanwhile, a cooling medium is introduced into the medium pipe, and in the descending process of the pile body, the cooling medium can freeze slurry on the side face of the pile body, so that the fixing effect on the pile body is improved, and the problem that the pile body shakes due to frozen soil melting is solved.

The invention provides a sinking aid device and method for a steel pipe pile in a hard sandy soil layer by utilizing high-pressure water jets, and solves the problem of defects in the use of the existing water-jet pile sinking method. Including steel pipe piles, a positioning ring is installed inside the steel pipe pile, a positioning annular groove is opened on the inner wall of the bottom end of the steel pipe pile, a positioning device matched with the positioning annular groove is installed on the outer side of the positioning ring, and a water pipe is installed at the bottom of the positioning ring There are annular water pipes installed in the water pipe plate, and a plurality of arc grooves run through the bottom surface of the water pipe plate. The bottom ball of the annular water pipe is hinged with a high-pressure nozzle located in each arc groove, and the annular water pipe is connected to the top plate. For the high-pressure water pipe, a nozzle ring is rotated in the water pipe plate, and nozzle forks located on both sides of each high-pressure nozzle are fixed on the outer surface of the nozzle ring. The steel pipe pile of the present invention can drill the sand layer under the steel pipe pile through the rotating sinking drill bit when the steel pipe pile is piling, so that the obstacles under the steel pipe pile can be cleared, and the pile driving efficiency is improved.

The invention relates to a pile guiding device for pile sinking, in particular to a pile guiding device capable of reducing noise during pile sinking construction. The pile guiding device capable of reducing the noise during pile sinking construction comprises a hammer and a pile head, the hammer is hoisted in a pile cavity and can move up and down in the pile cavity; the tip end of the pile headextends out of the bottom of a pile, the top is clamped into the pile cavity, a lifting member is fixedly connected to the top of the pile head, and the other end of the lifting member penetrates through the axial direction of the hammer to be is connected with an outer member; and the hammer hammers the pile head under the external force effect to drive the pile to move downwards. Compared with the prior art, the pile guiding device has the following advantages that the effect of upper side resistance of a soil layer on a pile body is reduced, and the pile sinking efficiency is improved; andthe hammer works in the pile cavity, and noise during pile sinking construction is greatly reduced.

The invention provides a pile sinking construction method based on an assembly movable platform. The method comprises the following steps that a, steel pipe piles are constructed in a plate pile construction area in the plate pile paving direction side by side; b, the tops of each row of steel pipe piles are provided with a transverse beam; c, longitudinal beams are uniformly arranged between every two transverse beams at intervals and are distributed in the plate pile paving direction; d, panels parallel to the transverse beams are arranged on the longitudinal beams; e, crawler cranes are placed on a walking plane; f, guiding frames are erected between the tops of the two transverse beams which are not provided with the panels; g, plate piles are lifted through the crawler cranes, and the plate piles are constructed after being subjected to guiding positioning through the guiding frame; and h, the panels, the longitudinal plates and the guiding frames between the two transverse beams close to the plate piles are disassembled, and the steps from f to g are repeated in the area where the plate piles are not constructed. According to the pile sinking construction method based on the assembly movable platform, the stress is clear, the method cannot be influenced by wind waves, and the precision and efficiency of pile sinking are high.

The present invention relates to the field of foundation engineering technology, and discloses a large pipe pile driving pile tip structure for dock engineering, comprising: a connecting platform connected to a pile driving column; a connecting frame arranged at the bottom of the connecting platform, and the connecting frame is rotatably connected to the bottom of the connecting platform; by arranging the connecting platform, the connecting frame, the crushing boss and the crushing frame, during the pile driving process, the pile column drives the connecting platform to move toward the connecting frame, and the rotating component can rotate the connecting frame to rotate the crushing boss, the pile tip body and the crushing frame. The rotating motion can effectively cut and crush the foundation soil layer, thereby improving the penetration ability of the pile body. The crushing frame in the crushing boss is connected to the pile tip body, and further crushes the hard soil layer or rock layer during the rotation process, thereby improving the pile driving efficiency, especially in hard rock layers or dense sand layers, which greatly improves the effect of the pile driving work.

The invention provides a prefabricated and movable type platform for pile sinking. The prefabricated and movable type platform for pile sinking is characterized by comprising multiple steel pipe piles which are distributed side by side in the sheet-pile laying direction, wherein the tops of each row of steel pipe piles are provided with a cross beam, longitudinal beams are arranged at equal intervals between every two adjacent cross beams in the sheet-pile laying direction, no longitudinal beam is arranged between the two cross beams located on the edge of a sheet-pile construction area, face sheets are distributed between every two adjacent cross beams, the multiple face sheets are supported on the upper portions of the longitudinal beams and form a walking plane, crawler cranes are placed on the walking plane and can normally walk on the walking plane, no face sheet is arranged between the two cross beams on the edge of the sheet-pile construction area, the two cross beams on the edge of the sheet-pile construction area are located outside the walking plane, and guide frames are arranged between the tops of the two cross beam not provided with the face sheet. The prefabricated and movable type platform for pile sinking is clear in stress, free from the influence of stormy waves and high in pile sinking precision and efficiency.

The utility model relates to the technical field of prestressed concrete piles, and discloses a prestressed concrete wave pile which comprises a wave pile body, an annular soil inserting plate is fixedly connected to the bottom of the wave pile body, and chamfers are arranged at the corners of the end, away from the wave pile body, of the annular soil inserting plate. The two sides of the wave pile body are fixedly connected with a mounting plate and a connecting plate which are matched, the mounting plate and the connecting plate are located on the inward sides of the two ends of the wave pile body correspondingly, the end, away from the annular soil inserting plate, of the wave pile body is fixedly connected with an annular splicing plate, and the side, away from the wave pile body, of the annular splicing plate is provided with a splicing groove matched with the annular soil inserting plate. According to the prestressed concrete wave pile, the annular soil inserting plates are fixed to the bottoms of the wave pile bodies, when the wave pile bodies are inserted into a soil layer for pile sinking, the wave pile bodies can be inserted into the soil layer more easily, the upper wave pile body and the lower wave pile body can be spliced more conveniently through the annular splicing plates, and the pile sinking efficiency is further improved.

The invention discloses a high-performance drag-reducing solidifying mud and a preparation method thereof. The high-performance drag-reducing solidifying mud comprises the following components by mass: 120-160 parts of cement, 250-300 parts of floating beads, 60-100 parts of bentonite, 1-3 parts of fluid loss reducer, 6-12 parts of swelling agent, 0.5-1.5 parts of polyvinyl alcohol, 0.2-0.6 parts of nanoemulsion, and 600-680 parts of water. The invention can reduce the interface friction coefficient through the lubrication effect of the nanoemulsion, and the ball effect of the floating beads and the foaming effect after the addition of polyvinyl alcohol can convert the sliding friction into rolling friction, greatly improving the lubrication and drag-reducing performance of the mud. In the later stage, as the cement hydration proceeds and the chemical reaction of polyvinyl alcohol and nanoemulsion proceeds, the mud gradually solidifies to form a solidified body with a certain strength, which can avoid the mud replacement process after pile pressing, shorten the entire pile pressing period, and improve the construction efficiency.

The invention discloses a hammering construction technology with a pile shoe and pile body self-weight expanding function. The self gravity of the prestressed pipe pile is utilized, and the prestressed pipe pile is lifted and then freely falls, so that impact force for driving the expanded pile shoe into a soil layer is brought to the expanded pile shoe; and in the sinking process of the expanding pile shoe, a pile side gap channel is formed through the pile diameter expanding effect of the expanding pile shoe, and the resistance of layered soil around the pile to the pile body of the prestressed pipe pile in the pile sinking process is reduced. After the pile end of the prestressed pipe pile enters the ground surface, the impact process of the pipe pile occurs underground, the construction noise can be well controlled, and the advantages of the prestressed pipe pile in the construction process of the ultra-long pipe pile are more obvious. And the lifting height of the pipe pile can be adjusted, that is, the pile falling stroke can be corrected according to the geological condition of the current pile sinking depth, and the pile sinking efficiency is higher.

The invention discloses a prefabricated hollow pile pipe valve-type pile shoe and a construction method thereof. The prefabricated hollow pile pipe valve-type pile shoe comprises a hollow pile pipe and a valve assembly, and the valve assembly is located at the lower end of the hollow pile pipe; the valve assembly comprises a plurality of valves, a plurality of fixed valves, a connecting ring and awedge-shaped plug, the multiple fixed valves and the multiple valves are connected to the connecting ring in a penetrating mode, the ends, close to the connecting ring, of the fixed valves are fixedly connected with the hollow pile pipe, and the valves can rotate relative to the hollow pile pipe; when the fixed valves and the valves are in a natural drooping state, a conical structure is formed;and when the wedge-shaped plug moves downwards under the action of external force, all the valves rotate outwards, and a circular ring is defined by the ends, close to the connecting ring, of the fixed valves and the ends, close to the connecting ring, of the valves. The prefabricated hollow pile pipe valve-type pile shoe is ingenious in structural design, convenient to operate, easy to use and low in construction cost.

The invention discloses a large U-shaped steel sheet pile construction technology. The large U-shaped steel sheet pile construction technology comprises the steps of digging grooves in the corresponding driven positions of U-shaped steel sheet piles; and carrying out insertion and vibration sinking on a plurality of U-shaped steel sheet piles in a segmented manner, and carrying out limiting and guiding on each U-shaped steel sheet pile from top and the from the bottom at the same time in the process of insertion and vibration sinking. With the large U-shaped steel sheet pile construction technology, the accuracy of pile sinking is high, and pile deviation and the pile top elevation can be effectively controlled.

The invention discloses a pile sinking positioning device, which relates to the technical field of positioning pile sinking equipment, comprising a positioning device, a transport device and a pile sinking device, the positioning device includes a bottom plate, a distance control machine and a driving wheel, and the transport device includes a belt connecting rod, The conveying belt and the belt limit groove, the pile sinking device includes a pile sinking connecting plate, a pile sinking lifting rod, a pile sinking block, a pile sinking rotary machine, a turning plate, a turning plate limiting groove, a rotating buckle and a rotating bottom plate; The control machine controls the driving wheel to carry out pile sinking positioning. A conveyor belt and multiple belt limit slots are provided on the conveyor belt to carry and transport the positioning piles. At the pile sinking site, the positioning piles on the conveyor belt are transported to In the limit groove of the turning plate of the turning plate, after turning over by the pile sinking turning machine, the pile sinking lifting rod drives the pile sinking block to strike repeatedly to complete the pile sinking work. The pile sinking efficiency is high, and the labor intensity of workers is small, which meets the needs of modern buildings.