Abrégé

Disclosed in the present invention is a construction method for a large-diameter cast-in-situ thin-walled prestressed concrete steel pipe pile. The construction method comprises the following steps: (1) drilling a pile hole; (2) sinking a steel frame carrying an anchor plate into the pile hole, the steel frame comprising an inner steel sleeve, a reinforcement cage, and a plurality of steel strands, the reinforcement cage being sleeved on the outer side of the inner steel sleeve, the plurality of steel strands being located on the outer side of the inner steel sleeve and arranged around the inner steel sleeve, and the bottom ends of the steel strands being fixed on the anchor plate; (3) pouring concrete to the outer side of the inner steel sleeve to form an annular concrete structure; (4) constructing a ring beam and maintaining the ring beam to a set strength, enabling the steel strands to pass through the ring beam, then applying prestress, and performing locking; and (5) constructing an underground structure until a relative elevation is reached, and pulling out the inner steel sleeve. Also disclosed in the present application is a large-diameter cast-in-situ thin-walled prestressed concrete steel pipe pile formed by using the construction method. The present application has good construction performance in various soil properties, and a formed pile body is stable and reliable in quality.

Classes IPC  ?

• E02D 5/38 - Pieux en béton ou analogue coulés en place par utilisation de tubages ou autres coffrages

Abrégé

Provided is a plastic casing secant pile construction method, the steps being: (1) constructing first pile holes (11, 12, 13) at intervals; (2) lowering a first steel reinforcing cage (31) carrying a first plastic hollow pipe (32) into the first pile holes (11, 12, 13), and pouring sand into the first plastic hollow pipe (32); pouring concrete into the first pile holes (11, 12, 13) to form a first pile body (39); (3) constructing a second pile hole (21, 22) between the adjacent first pile holes (11, 12, 13); (4) lowering a second steel reinforcing cage (41) carrying a second plastic hollow pipe (42) into the second pile holes (21, 22), and pouring sand into the second plastic hollow pipe (42); then pouring concrete into the second pile holes (21, 22) to form a second pile body (49); (5) hole-drilling between the adjacent first pile body (39) and second pile body (49) using a high-pressure rotary jet drill, and spraying cement slurry to form a cement mortar (50), said cement mortar (50) connecting the adjacent first pile body (39) and the second pile body (49) as one body.

Classes IPC  ?

• E02D 17/04 - Aménagement des bords ou consolidation des parois des trous de fondation
• E02D 5/38 - Pieux en béton ou analogue coulés en place par utilisation de tubages ou autres coffrages

Abrégé

A construction method for a pre-stressed pull-resistant anchor rod of a concrete expansion head, comprising the steps of: 1) movably pressing a steel casing (13) against a pile end anchor (14) and sinking same down together to a set depth, wherein a steel strand (16) is fixedly connected to the pile end anchor (14), and a protective tube (17) fixed on an anchor plate (141) is sleeved on the steel strand (16); 2) pouring fine stone concrete (20) between the steel casing (13) and the protective tube (17); 3) lifting the steel casing (13) upward and inserting same downward repeatedly, so that the fine stone concrete (20) flows out of the steel casing (13) to gradually form a concrete expansion head (21); continuously pouring the fine stone concrete (20) to form a pile body of a set height in the steel casing (13); 4) pulling out the steel casing (13); and 5) excavating earthwork to a set depth, and once the concrete expansion head (21) reaches a curing period, tensioning and locking the steel strand (16). The concrete expansion head (21) is formed from fine stone concrete (20), is formed as an integrated body with surrounding soil, and has higher pull-resistant bearing capacity. There is no problem of sediment being present at the bottom of a hole during construction.

Classes IPC  ?

• E02D 5/74 - Moyens d'ancrage d'éléments de structure ou de rideaux de palplanches

Abrégé

An inclinometry robot, comprising an inclinometry pipe, an inclinometry portion and a driving device, wherein the inclinometry pipe comprises an underground pipe (11) and a steering pipe (16), which are in communication with each other, with an outer sleeve (63) sheathed outside the steering pipe (16); the inclinometry portion comprises an inclinometer (30), the inclinometer (30) comprises a protective pipe (31) and an inclinometry assembly, and rollers (32) are mounted outside the protective pipe (31); the underground pipe (11) is internally provided with a first guide channel (12), and the steering pipe (16) is internally provided with a second guide channel (18); when the steering pipe (16) rotates 180°, the rollers (32) can still enter the second guide channel (18) along the first guide channel (12); the driving device comprises a lifting portion and a steering portion; the lifting portion comprises a winch (53), a guide wheel (54) and a first electric motor (52); a traction rope (55) on the winch (53) is connected to the protective pipe (31) via the guide wheel (54); and the steering portion comprises a second electric motor (42). By means of the inclinometry robot and an inclination measuring method, a measuring point can be accurately positioned, so as to ensure that the inclinometer (30) can perform measurement at the determined height position and enable the inclinometer (30) to accurately complete 180° steering, which provides a guarantee for the accurate measurement of inclination.

Classes IPC  ?

• G01C 9/00 - Mesure de l'inclinaison, p. ex. par clinomètres, par niveaux
• G08C 17/02 - Dispositions pour transmettre des signaux caractérisées par l'utilisation d'une voie électrique sans fil utilisant une voie radio

Abrégé

The present application discloses an operation platform for pulling piles, wherein the operation platform comprises a support table, and the support table is cut into a first part and a second part by a continuous seam; the continuous seam comprises 6 to 12 steel sheet pile seams which are connected sequentially, the steel sheet pile seams are respectively referred to as first steel sheet pile seams and second steel sheet pile seams, and the first steel sheet pile seams and the second steel sheet pile seams are arranged in a staggered manner; notches of the first steel sheet pile seams face a first direction, notches of the second steel sheet pile seams face a second direction, and the first direction is opposite the second direction; and an H steel pile slit is configured corresponding to each of the first steel sheet pile seams. The present application further discloses a pile pulling device which comprises a first pile pulling machine, a second pile pulling machine and the operation platform. The present application further provides a method for pulling out combined steel sheet piles. By using the present application, a static pile pulling machine can be directly supported on the operation platform for operation, thereby reducing noise pollution to an operation area and the impact on a new building, especially avoiding the impact on the strength of the new building.

Classes IPC  ?

• E02D 9/02 - Enlèvement de rideaux de palplanches, de pieux, de tubages ou d'autres coffrages par arrachage
• E02D 9/00 - Enlèvement de rideaux de palplanches, de pieux, de tubages ou d'autres coffrages
• E02D 5/04 - Éléments préfabriqués en acier