Hu Xudong

Bio: Hu Xudong is an academic researcher. The author has contributed to research in topics: Pile & Bearing capacity. The author has an hindex of 4, co-authored 8 publications receiving 32 citations.

Bag bottom expanding rigid-flexible combined pile and construction method thereof

Abstract: The invention relates to a bag bottom expanding rigid-flexible combined pile. The bag bottom expanding rigid-flexible combined pile is formed by connecting the following prefabricated pipe piles including a TSC (prestress concrete thin wall concrete) pile, a PRC (prestress reinforcement concrete) pile and a PHC (prestress high-strength concrete) pile from top to bottom. The bottom end of the PHC pile is provided with a pile bottom expander packed by a bag; the inside of the prefabricated pipe piles is provided with a grouting duct; both ends of every pile is provided with perforated pipe pile joints, and the side wall of the pile at the bottom is provided with a grout outlet; the outside of the combined pile is packed by surrounding cemented soil. According to the bag bottom expanding rigid-flexible combined pile, based on the law of horizontal load bearing of the pile bodies inside soil, the prefabricated pipe piles with the anti-bending and anti-shearing performance gradually improved, which are connected in a combined mode, are sequentially planted inside the cemented soil, and the expanded is grouted after the bag with stable characteristics is set to improve the vertical bearing capacity of the piles, so that relatively higher technical and economical benefits can be obtained. The invention also discloses a construction method of the bag bottom expanding rigid-flexible combined pile.

PHC (prestressed concrete pipe pile) pile streamline conveying production line

Abstract: The invention belongs to a production process of a PHC pile and relates to a PHC pile streamline conveying production line. The production line is characterized by comprising a whole production workshop formed by a left area, a middle area and a right area, wherein from the front part to the back part of the workshop, the left area is sequentially provided with a blending floor, an end plate processing area, a steel reinforcement cage, an end plate assembling area and a steel reinforcement cage roll welding area, the middle area is sequentially provided with a concrete spreading area, a cage loading area, an oil spraying pool, a die-cleaning pool, a die-detaching area, and a steel rod precisely cutting and heading area, and the right area is sequentially provided with a tensioning area, a centrifugal molding area, a steaming area, a pipe pile expanding area, a product inspection and code-spraying identifier area, a to-be-high pressure steamed semi-finished pipe pile storing area and a high pressure kettle-entering transition carriage pit. The production line has the beneficial effects that plane circular arrangement is adopted, and the occurrence rate of accidents is reduced due to the adoption of a stereo lifting technical mode that the upper surface and the lower surface are mutually moved; and due to the adoption of a slope platform and a slope rail, the pipe pile is moved, the distance of carriage movement is greatly shortened, and the energy consumption is reduced.

High-strength concrete prestress prefabricated (PHC) sheet pile

Abstract: The utility model relates to a high-strength concrete prestress prefabricated (PHC) sheet pile which comprises a main reinforcing bar, a spiral stirrup and PHC tubular pile bodies made of concrete. The PHC sheet pile is characterized in that lock catch connecting components are symmetrically arranged on peripheral surfaces of two sides of each PHC tubular body, and the plurality of PHC tubular pile bodies are connected through the lock catch connecting components to form the PHC sheet pipe. The PHC sheet pile has the advantages that the problem that ordinary PHC tubular piles are not applicable to the sheet pile structure is solved by precasting of connecting pieces in a reinforcement cage and post-welding of the lock catch connecting components on the connecting pieces; and due to the fact that manufacturing cost of the PHC tubular piles is low and different pile sinking technologies can be selected according to different construction geological conditions, the construction technology of the PHC sheet pile with the tubular piles as the main body is simple, recycling is not needed after the usage, the defect that engineering cost of steel sheet piles is high is overcome, and construction efficiency is improved.

Concrete tubular pile

Abstract: The utility model relates to a concrete tubular pile which is characterized by comprising a concrete tubular pile body, a steel reinforcement cage and end plates which are fixed at the two ends of the steel reinforcement cage. The steel reinforcement cage is composed of spiral reinforcing bars and main reinforcing bars. The main reinforcing bars are fixedly connected with the spiral reinforcing bars through nonprestressed reinforcement. The concrete tubular pile has the beneficial effects that stressed method is reasonable. All the main reinforcing bars of the steel reinforcement cage accept HRB 400 reinforcing bars. When the HRB 400 reinforcing bars are cold drawn to improve flexural capacity of the tubular pile, the reinforcing bars can be obtained conveniently, wherein the reinforcing bars are basically with the same stress, and therefore the stress of the tubular pile is even. Horizontal bearing capacity of the tubular pile can be improved greatly by the HRB 400 reinforcing bars. A technological process is convenient and fast. The HRB 400 reinforcing bars are adopted by the main reinforcing bars of the steel reinforcement cage, the spiral reinforcing bars are arranged outside the main reinforcing bars, and therefore connection can be finished through a roll welding method, and manufacturing efficiency of the steel reinforcement cage of the tubular pile is improved. The horizontal bearing capacity of the tubular pile is improved effectively, and usages of the tubular pile are increased, wherein the tubular pile can be used in projects such as a foundation pit, a side slope and an embankment and buildings with an anti-earthquake degree of more than seven.

Production stream line for conveying prestress high concrete (PHC) pipe piles

Abstract: The utility model belongs to a technology for producing prestress high concrete (PHC) pipe piles, and relates to a production stream line for conveying PHC pipe piles. The production stream line is characterized by comprising a whole workshop which is formed by a left area, a middle area and a right area, from the front to the back of the workshop, the workshop in the left area sequentially provided with a blending building, an end plate processing area, a steel reinforcement cage and end plate assembly area and a steel reinforcement cage roll welding area; the workshop in the middle area is sequentially provided with a concrete spreading area, a caging area, an oil injection tank, a mold cleaning tank, a mold removing area and a steel bar fine cutting and heading area; and the workshop in the right area is sequentially provided with a stretching area, a centrifugal molding area, a steam curing area, a pipe pile stretching area, a product inspecting and sprayed code marking area, an area for storing semi-finished pipe piles to be steam-cured at high pressure and an inlet autoclave transition carriage pit. The production stream line has the beneficial effects that planar circulation arrangement is adopted, and the accident occurrence rate is reduced through an up and down inter-moving stereoscopic lifting technological mode; and an inclined platform and an inclined track are adopted to move the pipe piles, so that the moving distance of a travelling crane is greatly shortened, and the energy consumption is reduced.

Bag bottom expanding rigid-flexible combined pile and construction method thereof

Abstract: The invention relates to a bag bottom expanding rigid-flexible combined pile. The bag bottom expanding rigid-flexible combined pile is formed by connecting the following prefabricated pipe piles including a TSC (prestress concrete thin wall concrete) pile, a PRC (prestress reinforcement concrete) pile and a PHC (prestress high-strength concrete) pile from top to bottom. The bottom end of the PHC pile is provided with a pile bottom expander packed by a bag; the inside of the prefabricated pipe piles is provided with a grouting duct; both ends of every pile is provided with perforated pipe pile joints, and the side wall of the pile at the bottom is provided with a grout outlet; the outside of the combined pile is packed by surrounding cemented soil. According to the bag bottom expanding rigid-flexible combined pile, based on the law of horizontal load bearing of the pile bodies inside soil, the prefabricated pipe piles with the anti-bending and anti-shearing performance gradually improved, which are connected in a combined mode, are sequentially planted inside the cemented soil, and the expanded is grouted after the bag with stable characteristics is set to improve the vertical bearing capacity of the piles, so that relatively higher technical and economical benefits can be obtained. The invention also discloses a construction method of the bag bottom expanding rigid-flexible combined pile.

Concrete pipe pile automatic production line

Abstract: The invention discloses a concrete pipe pile automatic production line. The concrete pipe pile automatic production line is characterized by comprising a feeding region, wherein a concrete agitator and a distribution car are arranged in the feeding region; a mould combination region is arranged behind the feeding region; a crane which can move pipe moulds to the mould combination region is arranged between the feeding region and the mould combination region; a tensioning region is arranged behind the mould combination region; a tensioning machine is arranged in the tensioning region; a centrifugal region is arranged behind the tensioning region; a centrifugal machine is arranged in the centrifugal region; a normal temperature steaming and maintaining region is arranged behind the centrifugal region; a steaming and maintaining pond is arranged in the normal temperature steaming and maintaining region; a mould demounting region is arranged behind the normal temperature steaming and maintaining region; a releasing machine for demounting upper nuts of the pipe moulds is arranged in the mould demounting region; a woven cage region is arranged behind the mould demounting region; upper mould conveying chains and lower mould conveying chains for conveying the pipe moulds are respectively arranged on one sides or centers of the mould demounting region, the normal temperature steaming and maintaining region, a centrifugal region and a mould combination region, the crane is arranged between the woven cage region and the mould demounting region, and a high pressure steaming and maintaining region is arranged behind the woven cage region.

PHC (prestressed concrete pipe pile) pile streamline conveying production line

Abstract: The invention belongs to a production process of a PHC pile and relates to a PHC pile streamline conveying production line. The production line is characterized by comprising a whole production workshop formed by a left area, a middle area and a right area, wherein from the front part to the back part of the workshop, the left area is sequentially provided with a blending floor, an end plate processing area, a steel reinforcement cage, an end plate assembling area and a steel reinforcement cage roll welding area, the middle area is sequentially provided with a concrete spreading area, a cage loading area, an oil spraying pool, a die-cleaning pool, a die-detaching area, and a steel rod precisely cutting and heading area, and the right area is sequentially provided with a tensioning area, a centrifugal molding area, a steaming area, a pipe pile expanding area, a product inspection and code-spraying identifier area, a to-be-high pressure steamed semi-finished pipe pile storing area and a high pressure kettle-entering transition carriage pit. The production line has the beneficial effects that plane circular arrangement is adopted, and the occurrence rate of accidents is reduced due to the adoption of a stereo lifting technical mode that the upper surface and the lower surface are mutually moved; and due to the adoption of a slope platform and a slope rail, the pipe pile is moved, the distance of carriage movement is greatly shortened, and the energy consumption is reduced.

High-frequency vibration-punching base expansion grouting pipe pile and construction method thereof

Abstract: The invention discloses a high-frequency vibration-punching base expansion grouting pipe pile and a construction method of the high-frequency vibration-punching base expansion grouting pipe pile. A match-end-shaped rubble and concrete composite body coated with cement slurry is arranged at the lower end of a high-frequency vibration-punching base expansion grouting pipe pile body, and is formed by construction waste and the cement slurry in a condensation mode, and the average diameter of the construction waste ranges from 3 cm to 8 cm. The construction method comprises the steps that hammering and static pressing are carried out on the pipe pile according to the design requirements so that the pipe pile body can have the designed elevation, a high-frequency vibration punching device is used for carrying out vibration punching on the bottom of the pipe pile body, the bottom of the pipe pile body is filled with small-particle construction waste and the cement slurry, and the rubble and concrete composite body is formed at the lower end of the pipe pile body. The high-frequency vibration-punching base expansion grouting pipe pile has high supporting strength, and the high bearing capacity of the high-frequency vibration-punching base expansion grouting pipe pile is ensured through the rubble and concrete composite body. According to the construction method of the high-frequency vibration-punching base expansion grouting pipe pile, the high-frequency vibration-punching grouting pipe pile can effectively penetrate through a sand layer and a crust, construction efficiency is high, the construction cost is low, the single high-frequency vibration-punching base expansion grouting pipe pile is high in bearing capacity, high efficiency and environmental friendliness are achieved, and the construction method is applicable to the situation that a free drop hammer is used in the pipe pile body to tamp the construction waste so that an expanded head can be formed.

Vertical reinforcing rib reinforced bag grouting pile and construction method

Abstract: The invention relates to a vertical reinforcing rib reinforced bag grouting pile and a construction method. The pile mainly comprises a prefabricated pipe pile, a prefabricated enlarged toe pile end with one part of the prefabricated pipe pile, a bottom filling enlarged toe pile end, a vertical reinforcing rib, a multi-section back expansion rib, a fixed disc, a bag, a steel plate pile tip, a pipe pile joint, a separate orifice positioning steel plate, a pile periphery reinforcing area, a grouting expanded bottom, a steel plate pile tip top pipe element, a top anchor plate and a foundation baseplate; pile connecting holes are respectively formed in the top and the bottom of the pipe pile; and an upper-section pile and a lower-section pile are connected through a pile connecting rod. An integral circular connecting inner sleeve and a separate arc connecting outer plate with a reverse triangular flange plate are sleeved in the pile connecting place by a stud and a nut. The technical method is convenient to construct, low in construction cost and low in technical requirements on engineering constructors, and can greatly improve the bend and shear resistance of the whole foundation pile. The method is simple in construction process, high in operability, convenient to control the quality, obvious in economic benefit and prominent in treatment effect.