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CN-224227776-U - Prefabricated screw pile and screw pile die

CN224227776UCN 224227776 UCN224227776 UCN 224227776UCN-224227776-U

Abstract

The utility model discloses a prefabricated spiral pile and a spiral pile mold, and belongs to the technical field of building pile foundation engineering, wherein the prefabricated spiral pile comprises a pile body; the pile comprises a pile body, a groove, a starting point A, a stopping point B, a groove and a stop point B, wherein the groove is a single spiral groove and is continuously spirally distributed on the peripheral surface of the pile body, the starting point A is set as the starting point A, the starting point A is connected to the end face of one end of the pile body or is separated from the end face of one end of the pile body, and the stopping point B is separated from the end face of the other end of the pile body. The cross section of the groove is preferably isosceles trapezoid, and is used for shearing soil layers and returning soil. The utility model can effectively reduce the condition that the pile head of the prefabricated spiral pile is broken due to stress concentration in the construction process, and increases the contact surface area of the prefabricated spiral pile, thereby increasing the bearing capacity.

Inventors

  • Zha Jia

Assignees

  • 上海嘉城筑友建材科技有限公司
  • 江苏嘉正红新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20250423

Claims (19)

  1. 1. A prefabricated screw pile is characterized by comprising, A pile body; the grooves are single spiral grooves and are spirally distributed on the outer peripheral surface of the pile body; the starting point of the groove is A, the ending point is B, the starting point A is connected to the end face of one end of the pile body or is separated from the end face of one end of the pile body, and the ending point B is separated from the end face of the other end of the pile body.
  2. 2. A preformed helical pile according to claim 1, wherein the distance from the termination point B to the end face of the other end of the pile body is set to be H 2 ,30cm<H 2 cm or less.
  3. 3. A preformed helical pile according to claim 2, wherein the distance from the start point a to the end face of one end of the pile body is set to be H 1 ,30cm<H 1 cm or less.
  4. 4. A preformed helical pile according to claim 1, wherein the cross-section of the groove is trapezoidal, the cross-section outside vertical length of the groove being greater than the cross-section inside vertical length of the groove.
  5. 5. A preformed helical pile according to claim 4, wherein the cross section of the groove is isosceles trapezoid, and the depth of the groove is l,0<l cm or less.
  6. 6. A preformed helical pile according to claim 5, wherein the transverse cross-section of said groove has an outer vertical length of a and an inner vertical length of b, 0<a-b <4cm.
  7. 7. A preformed helical pile according to claim 6, wherein the pitch m of the flutes is equal.
  8. 8. A precast screw pile as defined in claim 7, wherein the formula of the side friction resistance value Q sk of the precast screw pile is: Length of the grooves of the ith layer
  9. 9. A precast helical pile as claimed in claim 8, in which the pitch m is in the range 25< m <60cm.
  10. 10. A preformed helical pile according to claim 9, characterised in that a-b = 2cm, a = 10cm, m = 40cm, l = 2cm.
  11. 11. A preformed helical pile according to claim 7, wherein the outside area of said recess is 1/6-1/2 of the surface area of the side face of said pile body.
  12. 12. A preformed helical pile according to claim 7, wherein the inclination of the grooves is 5 ° -60 °.
  13. 13. A preformed helical pile according to claim 7, wherein the ratio of the outside vertical length a of the groove to the clear length m-a between adjacent threads is 1/5-1.
  14. 14. A preformed helical pile according to claim 1, further comprising a through hole disposed coaxially with said pile body, through said pile body.
  15. 15. A preformed helical pile according to claim 1, wherein said grooves are continuously helically distributed around the outer circumference of said pile body.
  16. 16. A preformed helical pile according to claim 1, wherein said grooves are intermittently helically distributed around the outer circumference of said pile body.
  17. 17. A preformed helical pile according to claim 1, wherein the start point a and the end point B lie in the same plane.
  18. 18. A screw pile mould for producing a prefabricated screw pile according to any one of claims 1 to 17.
  19. 19. A screw pile mould according to claim 18, comprising a first module, a second module, a first projection and a second projection, the first module and the second module being of the same size, the first projection and the second projection being provided on the inner side of the first module and the second module respectively, the first projection and the second projection being identical to the recess after being split.

Description

Prefabricated screw pile and screw pile die Technical Field The utility model relates to the technical field of building pile foundation engineering, in particular to a prefabricated spiral pile and a spiral pile mold. Background In recent years, with the acceleration of the urban process and the improvement of the construction requirements of infrastructures, the bearing capacity, the construction efficiency and the environmental protection requirements of pile foundation engineering under complex geological conditions are increasingly severe. Traditional bored concrete piles, stirring piles, spiral piles and the like are subjected to foundation construction through field wet operation, influence is brought to urban environment, precast piles become main substitutes, but with the development of industry, the types of precast piles are more and more, from traditional tubular piles and square piles to later special-shaped piles, the precast piles provide certain end bearing force except pile ends, main bearing force is mainly provided through side friction force between pile bodies and soil bodies, and special-shaped piles such as bamboo joint piles and spiral friction piles are arranged on the market at present to increase friction force of pile bodies. However, in the prior art, the soil cannot return to the necking end in a short time due to reaming of the soil by the bamboo joints, so that friction force is reduced and sedimentation occurs, and the engineering quality is affected, and meanwhile, the pile body is easy to crack due to overlarge protective reinforcement layers at the bamboo joints. The spiral friction pile in the prior art is usually characterized in that spiral grooves extend to the end faces of two ends of the pile body, meanwhile, the number of grooves is increased or friction force is improved by grouting the grooves, the number of threads is increased, the section of the pile is reduced, construction stress is concentrated to affect quality, meanwhile, the grooves are deepened and the number of grooves is increased to improve friction force, the reinforcing steel bar protection layer is too thick, the pile body is easy to crack, the service life of the pile is affected, and the pile head and the pile body are easy to crack due to the concentration of hammering stress in the construction process. Whether it is expanded bamboo joint stake or necking down screw pile, its bearing capacity still needs to see the soil property of construction site, because the lower extreme of stake needs to reach good soil layer and plays certain built-in action, and the middle soil layer of stake is relatively poor, especially flows the muddy soil of moulding state, so screw pile and bamboo joint stake get into under the condition of the soil layer of soil property, and soil can reduce the bearing capacity because of unable the benefit back. Disclosure of utility model The utility model aims to provide a prefabricated spiral pile and a spiral pile die, which are used for enhancing the bearing capacity of the prefabricated spiral pile and preventing the pile head of the prefabricated spiral pile from being broken in the construction process. The technical scheme includes that the prefabricated spiral pile comprises a pile body, grooves, wherein the grooves are single spiral grooves, the grooves are spirally distributed on the outer peripheral surface of the pile body, the starting point of each groove is A, the ending point of each groove is B, the starting point A is connected to the end face of one end of the pile body or is separated from the end face of one end of the pile body, and the ending point B is separated from the end face of the other end of the pile body. In a preferred embodiment of the present utility model, the distance from the end surface of the end point B to the other end of the pile body is H 2,30cm<H2 cm or less. In a preferred embodiment of the present utility model, the distance from the starting point A to the end surface of one end of the pile body is H 1,30cm<H1 cm or less. In a preferred embodiment of the present utility model, the cross section of the groove is trapezoidal, and the vertical length of the outer side of the cross section of the groove is greater than the vertical length of the inner side of the cross section of the groove. In a preferred embodiment of the utility model, the cross section of the groove is isosceles trapezoid, and the depth of the groove is l,0<l is less than or equal to 3cm. In a preferred embodiment of the utility model, the transverse cross-section of the groove has an outside vertical length of a and an inside vertical length of b, 0<a-b <4cm. In a preferred embodiment of the utility model, the pitch m of the grooves is equal. In a preferred embodiment of the present utility model, the formula of the side friction resistance value Q sk of the pre-fabricated screw pile is: Length of the grooves of the ith layer In a preferred embodiment of the